# fallacy.wiki — the complete corpus > All 91 entries in full: definition, example, counter-move, origin, further examples, spotting tells and sources. This file is the entire English content of the site — nothing else needs to be fetched. - **Licence:** CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to share and adapt, including commercially and for model training, with attribution to fallacy.wiki. - **Publisher:** phi holdings - **Corpus last changed:** 2026-08-10 - **In Arabic:** https://fallacy.wiki/ar/llms-full.txt Fallacy names are not standardised in either language, and several entries overlap or nest inside each other. The clusters are a judgement call, not a settled taxonomy. ======================================================================== # Crowds and prestige Numbers, custom and status standing in for reasons ======================================================================== # Argumentum ad populum *Also called: Appeal to popularity, bandwagon* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/ad-populum/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/ad-populum.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating the number of people who hold a belief as evidence that the belief is true. ## In the wild > Everyone knows organic food is healthier, so it must be. ## How to answer it Ask what the majority is basing its view on. Popularity is a fact about people, not about the claim. ## Origin and naming Latin for 'argument to the people'. Logicians have catalogued it since the nineteenth century under many names — appeal to the masses, bandwagon, vox populi — all pointing at the same move: the size of the crowd is offered as proof. ## More places it shows up - Half the city switched banks this year; obviously that one is the better choice, or people would not be moving. - This neighbourhood voted overwhelmingly for the measure, which shows the rest of us were wrong to doubt it. - It is the most-watched series in the country right now — critics who pan it clearly just did not understand it. - Everyone in the group chat bought one, so anything holding you back must be your own stubbornness. ## How to spot it - Listen for verbs of mass movement — 'everyone is switching', 'millions agree' — standing where reasons should be. - Notice when disagreement is treated as loneliness: the subtext is that you will be left out, not that you are mistaken. - Check whether the crowd would even know; a million people repeating a rumor is still one rumor. ## Nearby - [Appeal to common practice](https://fallacy.wiki/fallacy/common-practice.md) - [Appeal to tradition](https://fallacy.wiki/fallacy/tradition.md) - [Snob appeal](https://fallacy.wiki/fallacy/snob-appeal.md) - [Argumentum ad nauseam](https://fallacy.wiki/fallacy/ad-nauseam.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argumentum_ad_populum) - [Fallacy Files](https://fallacyfiles.org/bandwagn.html) # Appeal to common practice *Also called: Everyone does it* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/common-practice/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/common-practice.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Justifying an action because it is widely done, rather than because it is right. ## In the wild > Everybody rounds up their hours on timesheets, so it is fine. ## How to answer it Separate frequency from justification. Ask whether the practice would survive being stated openly. ## Origin and naming The everyday version of ad populum aimed at conduct rather than belief: 'everyone does it' offered as a permit. Textbooks have listed it for decades, usually as a cousin of the bandwagon and of 'two wrongs make a right'. ## More places it shows up - Every shop on this street leaves the excess packaging loose on the pavement, so our pile is nothing unusual. - All the parents let their kids keep phones at the dinner table; being strict about it would only make you the outlier. - Everyone in the league parks across two spaces on match day, so one more car makes no difference. - Every freelancer I know inflates the estimate a bit to cover delays — it is simply how the work gets quoted. ## How to spot it - Listen for the shift from 'is it right?' to 'how common is it?' — the second question quietly answers the first. - Notice when the defence would embarrass its user if read aloud at a meeting: secrecy is doing the moral work. - Notice when the defence collapses the moment one person in the room says they do not do it. ## Nearby - [Argumentum ad populum](https://fallacy.wiki/fallacy/ad-populum.md) - [Two wrongs make a right](https://fallacy.wiki/fallacy/two-wrongs.md) - [Appeal to tradition](https://fallacy.wiki/fallacy/tradition.md) ## Read more - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) - [Wikipedia](https://en.wikipedia.org/wiki/Argumentum_ad_populum) # Appeal to tradition *Also called: Argumentum ad antiquitatem* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/tradition/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/tradition.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Holding that something is correct or best because it is long established. ## In the wild > We have always done onboarding this way, so it works. ## How to answer it Ask what the practice was originally solving and whether that problem still exists. ## Origin and naming Latin argumentum ad antiquitatem, 'argument from age'. Longevity is treated as a credential: if a custom has survived this long, it must be doing something right — a shortcut that can be true and often is, which is exactly why it gets abused. ## More places it shows up - The clinic keeps booking appointments by phone because that is how patients have always done it, despite the missed-call queue out the door. - A municipality defends a decades-old traffic junction on the grounds that it has served the town for generations, while the accident reports accumulate. - A family business refuses invoices by email because the founder signed every bill by hand, and desks now buckle under paper. - A music curriculum still spends its year on the syllabus its teachers inherited, because it produced fine graduates fifty years ago. ## How to spot it - Listen for 'we have always' — the sentence compression of a practice that no longer needs to introduce itself. - Notice when the defence cites the past's results but not today's conditions; old successes are offered as current evidence. - Watch for the question of cost going unasked; a tradition can survive precisely because nobody was allowed to audit it. ## Nearby - [Appeal to novelty](https://fallacy.wiki/fallacy/novelty.md) - [Chronological snobbery](https://fallacy.wiki/fallacy/chronological-snobbery.md) - [Argumentum ad populum](https://fallacy.wiki/fallacy/ad-populum.md) - [Appeal to common practice](https://fallacy.wiki/fallacy/common-practice.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_tradition) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Appeal to novelty *Also called: Argumentum ad novitatem* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/novelty/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/novelty.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Holding that something is better simply because it is newer. ## In the wild > This framework came out last month, so it is better than the old one. ## How to answer it Ask which specific problem the new version fixes and what it costs to switch. ## Origin and naming Latin argumentum ad novitatem, 'argument to the new' — recency itself offered as a merit. It is the mirror image of the appeal to tradition: both stop at the calendar and decline to weigh anything else. ## More places it shows up - A team rebuilds its service in a six-week-old language because 'the old stack is dated', and spends the year rediscovering solved problems. - A news panel assumes the candidate with the newest policy paper must be the most serious, though no one has read past the cover. - Parents buy the just-released 'smart' toy over the proven one, reasoning that a newer design must understand children better. - A gym member abandons a programme that was working for a routine trending this month, certain that current means improved. ## How to spot it - Listen for dates doing the argument's work — 'this is 2026' — with no mention of what actually broke in the old way. - Notice when 'outdated' is asserted, never diagnosed; ask what specifically failed and the room goes quiet. - Notice when the newest option wins every comparison by default, and the burden of proof is quietly shifted to incumbents. ## Nearby - [Appeal to tradition](https://fallacy.wiki/fallacy/tradition.md) - [Chronological snobbery](https://fallacy.wiki/fallacy/chronological-snobbery.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_novelty) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Snob appeal *Also called: Appeal to prestige* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/snob-appeal/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/snob-appeal.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating association with an elite or admired group as evidence of quality. ## In the wild > The best teams use this tool, so we should too. ## How to answer it Ask what those teams need it for and whether your constraints match theirs. ## Origin and naming The bandwagon's smaller, better-dressed cousin: not 'everyone' believes it, but the right people do. Advertisers have run it for a century — sell the association, not the product — and economists describe the matching 'snob effect', where demand among elites rises precisely because the masses do not have it. ## More places it shows up - A consulting deck recommends a workflow because 'the best companies run it', skipping whether a twelve-person firm has their problems. - An interviewer asks a chef which pan 'professionals use', and the answer is treated as a verdict on what home cooks should own. - A neighbourhood's cafe raises its prices to be taken seriously, and regulars' praise of the 'real' taste tracks the receipt exactly. - A graduate joins a club she cannot afford because its name opens doors, then defends the fee as an investment in her seriousness. ## How to spot it - Notice when the evidence offered is a guest list: names of who uses it, not measurements of what it does. - Watch for the phrase 'serious people' or its local equivalent — content-free praise that exists only to shame doubters outside. - Check who benefits from your imitation; if the answer is the seller, the pedigree was the product. ## Nearby - [Argumentum ad populum](https://fallacy.wiki/fallacy/ad-populum.md) - [Appeal to authority](https://fallacy.wiki/fallacy/authority.md) - [Style over substance](https://fallacy.wiki/fallacy/style-over-substance.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argumentum_ad_populum) - [Wikipedia](https://en.wikipedia.org/wiki/Snob_effect) # Appeal to authority *Also called: Argumentum ad verecundiam* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/authority/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/authority.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Citing an authority as proof when the authority is outside their field, is not a consensus, or gives no reasons. ## In the wild > A physicist said this diet works, so it does. ## How to answer it Check whether the expertise matches the claim, and ask for the reasoning behind the verdict. ## Origin and naming Known in Latin as argumentum ad verecundiam, 'argument from modesty' — the deference we owe our betters, turned into evidence. John Locke gave it the first named treatment in his Essay Concerning Human Understanding in 1690, as one of four moves people make instead of reasoning. ## More places it shows up - A celebrated novelist posts that a new supplement cured her fatigue, and her fans order it before reading a single trial. - A Nobel laureate in economics endorses a foreign policy position on television, and interviewers treat his word as the last one. - The CEO is convinced the rebrand is right, and since she built the company, the team drops its objections without hearing her case. - A football manager is quoted explaining why a city should adopt his favourite tax scheme, and the clip circulates as if it were analysis. ## How to spot it - Watch for the title doing the work: the argument rests on who spoke, and no mechanism for how they know is offered. - Notice when the expert's field is never named — a 'leading scientist' whose lab you cannot place is decoration, not evidence. - Notice when asking 'why does she think so?' is answered with more of her biography instead of her reasons. ## Nearby - [False attribution](https://fallacy.wiki/fallacy/false-attribution.md) - [Snob appeal](https://fallacy.wiki/fallacy/snob-appeal.md) - [Genetic fallacy](https://fallacy.wiki/fallacy/genetic.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_from_authority) - [Fallacy Files](https://fallacyfiles.org/authorit.html) # False attribution *Also called: Fabricated source* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/false-attribution/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/false-attribution.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Supporting a claim with a source that is irrelevant, unqualified, unnamed, or invented. ## In the wild > A famous scientist said it, though he never did. ## How to answer it Ask for the original source and read it. Unverifiable attributions carry no weight. ## Origin and naming The fallacy of leaning on a source that is unqualified, unidentifiable, or invented. It flourished with the shareable quotation image: famous names like Einstein acquire whole sentences they never wrote, because a borrowed name travels farther than an honest one. ## More places it shows up - A revolution-era proverb gets attributed to a founding figure in a graduation speech; the oldest traceable version is a greeting card. - A viral post claims a chunk of the population has a disorder, citing 'recent studies' whose authors turn out to be the product's own marketing agency. - A manager closes a debate by saying Harvard proved that status meetings cut productivity, though she simply saw the figure in a slide deck years ago. - A forwarded voice note warns of a new regulation, quoting an 'official statement' that no ministry's website has ever hosted. ## How to spot it - The attribution is a fog: 'experts say', 'a study found', 'as the proverb goes' — phrases built to resist a search bar. - The quote is suspiciously memorable; real experts hedge, and fabricated ones are always quotable. - Ask where it was said or published, and the person goes quiet or answers with where they saw it — a share, never a source. ## Nearby - [Appeal to authority](https://fallacy.wiki/fallacy/authority.md) - [Quoting out of context](https://fallacy.wiki/fallacy/quoting-out-of-context.md) ## Read more - [Logically Fallacious](https://www.logicallyfallacious.com/logicalfallacies/False-Attribution) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Argumentum ad nauseam *Also called: Argument from repetition* - **Cluster:** Crowds and prestige — Numbers, custom and status standing in for reasons - **Page:** https://fallacy.wiki/fallacy/ad-nauseam/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/ad-nauseam.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating repetition as if it were support, so a claim gains credibility by being said often. ## In the wild > It has been said so often it must be true. ## How to answer it Count the arguments, not the mentions. Ask what new evidence each repetition added. ## Origin and naming Latin for 'argument to the point of nausea' — the claim is pushed until listeners are too tired of it to push back. Psychologists gave the underlying effect a name in 1977, when Hasher, Goldstein, and Toppino showed that repeated statements are rated truer purely because they were repeated. ## More places it shows up - A headline claims the economy is collapsing; the same claim, reworded, fills half your feed for a week, and by Friday it feels like common knowledge. - In every sprint retro the same engineer repeats that the codebase is unsalvageable, and over months the team starts treating a rewrite as settled without ever reading an audit. - An ad runs the same 'nine out of ten' line for years, and people eventually quote it as a statistic without ever asking nine out of ten whom. - A family elder says at every gathering that the eldest grandchild is the difficult one, and the cousins begin introductions with apologies for her before she speaks. ## How to spot it - Notice when the speaker's case is mostly the claim itself, restated in new clothes, rather than reasons. - Notice when you can no longer recall first disbelieving the claim — familiarity has quietly replaced argument. - Count how many times the point has been made versus how many times it has been supported; a large gap is the tell. ## Nearby - [Argumentum ad populum](https://fallacy.wiki/fallacy/ad-populum.md) - [Gish gallop](https://fallacy.wiki/fallacy/gish-gallop.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Ad_nauseam) - [Wikipedia](https://en.wikipedia.org/wiki/Illusory_truth_effect) ======================================================================== # Attacks on the source Judging the speaker instead of the argument ======================================================================== # Ad hominem *Also called: Attack on the person* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/ad-hominem/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/ad-hominem.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Rejecting an argument by attacking the character or circumstances of the person making it. ## In the wild > His budget analysis is wrong because he failed math in school. ## How to answer it Restate the argument without naming its author and ask whether it still holds. ## Origin and naming From the Latin 'argumentum ad hominem', 'argument to the person'. Named by philosophers to mark a rebuttal that answers the speaker rather than the speaking. It is as old as rhetoric itself. ## More places it shows up - Don't take her climate research seriously — she used to work in the oil industry. - Of course he supports the new tax code; he stands to profit from it, so his analysis must be wrong. - You can't trust his essay on food policy; I've heard he's a slob in person. - Her solution to the committee gridlock may be sound, but let's not forget she hasn't chaired anything yet. ## How to spot it - Notice when the reply names who said it before what was said. - Notice when the answer would be the same even if the argument changed completely. - Notice when the case against the person gets the loud airtime, and the case against the claim goes unanswered. ## Nearby - [Tu quoque](https://fallacy.wiki/fallacy/tu-quoque.md) - [Poisoning the well](https://fallacy.wiki/fallacy/poisoning-well.md) - [Genetic fallacy](https://fallacy.wiki/fallacy/genetic.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Ad_hominem) - [The Fallacy Files](https://fallacyfiles.org/adhomine.html) # Tu quoque *Also called: You too, appeal to hypocrisy* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/tu-quoque/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/tu-quoque.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Dismissing a claim because the speaker does not live up to it. ## In the wild > You cannot tell me to quit smoking, you smoke too. ## How to answer it Grant the hypocrisy and ask whether the advice is still correct. ## Origin and naming Latin for 'you too'. It is counted as a species of ad hominem: instead of meeting the argument, the reply charges the arguer with inconsistency. The hypocrisy may be real — and the advice may still be right. ## More places it shows up - A doctor tells a patient to cut salt; the patient replies, 'You eat fast food between shifts, I have seen the wrappers.' - A teammate says the pull request is too large to review safely; the author answers, 'Yours last sprint was twice this size.' - A neighbor asks you to leash your dog near the playground; you answer, 'Yours dug up my flowerbed all April.' - A finance minister urges spending cuts at a press conference, and the first question is, 'Didn't your government widen the deficit last year?' — the proposal itself is never discussed. ## How to spot it - Notice when the reply starts with 'you' instead of 'that claim'. - Notice when catching hypocrisy is treated as winning the point. - Notice when conceding 'yes, the speaker is inconsistent' changes nothing about the truth of the advice. ## Nearby - [Ad hominem](https://fallacy.wiki/fallacy/ad-hominem.md) - [Whataboutism](https://fallacy.wiki/fallacy/whataboutism.md) - [Two wrongs make a right](https://fallacy.wiki/fallacy/two-wrongs.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Tu_quoque) - [The Fallacy Files](https://fallacyfiles.org/tuquoque.html) # Genetic fallacy *Also called: Fallacy of origins* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/genetic/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/genetic.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Judging a claim by where it came from rather than what it says. ## In the wild > That idea came from a marketing team, so it is worthless. ## How to answer it Ask whether the origin changes the evidence. A good idea from a bad source is still good. ## Origin and naming Named for 'genesis' — origin. The Oxford Companion to Philosophy traces the term to Morris Raphael Cohen and Ernest Nagel's 1934 textbook 'An Introduction to Logic and Scientific Method', which warned against confusing how a belief arose with whether it is true. ## More places it shows up - A manager dismisses a cost-saving proposal at review because 'it started as an intern's side project,' without opening the numbers. - A reader rejects a documentary's findings on factory farming because the production company also makes entertainment shows. - During a school board meeting, a parent objects to a new math curriculum on the grounds that its authors once worked for a testing company — and the objection is treated as a verdict. - A patient dismisses a diet guideline solely because an early version of it was promoted by a cereal company decades ago. ## How to spot it - Notice when the biography of an idea is offered as a substitute for its content. - Notice when the word 'comes from' or 'started as' does all the argumentative work in the sentence. - Notice when the same fact would be accepted instantly if it had arrived through a different door. ## Nearby - [Ad hominem](https://fallacy.wiki/fallacy/ad-hominem.md) - [Etymological fallacy](https://fallacy.wiki/fallacy/etymological.md) - [Guilt by association](https://fallacy.wiki/fallacy/guilt-by-association.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Genetic_fallacy) - [Logically Fallacious](https://www.logicallyfallacious.com/logicalfallacies/Genetic-Fallacy) # Poisoning the well *Also called: Pre-emptive discrediting* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/poisoning-well/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/poisoning-well.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Discrediting a person in advance so that whatever they say is received as suspect. ## In the wild > Before he speaks, remember he has been wrong before. ## How to answer it Name the move out loud, then insist the argument be heard on its own terms. ## Origin and naming The term was fixed in its fallacy sense by John Henry Newman in 'Apologia Pro Vita Sua' (1864). Rebutting Charles Kingsley, Newman accused him of trying 'to poison by anticipation the public mind against me', adding: 'This I call poisoning the wells.' The image is older than the label — a contaminated well keeps poisoning every bucket drawn from it. ## More places it shows up - Before the candidate's first town hall, an opponent runs an ad that only recaps her old business failure, so every word she says on the economy arrives pre-dismissed. - A coworker introduces the new analyst to the team by adding, 'He means well, even if his last report had to be retracted.' - A subreddit pins a comment warning that the author of an incoming long post 'is known for conspiracy theories' before anyone has read a sentence of it. - Opening the parent-teacher meeting, a parent says, 'We all remember what happened with the last field trip,' and the teacher's entire proposal is heard through that frame. ## How to spot it - Notice the briefing that arrives before the witness does. - Notice when 'remember what he did last time' is offered before 'here is what he says this time.' - Notice when you already distrust a speaker and cannot name anything they said in this conversation. ## Nearby - [Ad hominem](https://fallacy.wiki/fallacy/ad-hominem.md) - [Guilt by association](https://fallacy.wiki/fallacy/guilt-by-association.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Poisoning_the_well) - [The Fallacy Files](https://fallacyfiles.org/poiswell.html) # Quoting out of context *Also called: Contextomy* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/quoting-out-of-context/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/quoting-out-of-context.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Removing words from their surroundings so they carry a meaning the speaker did not intend. ## In the wild > He called the plan ambitious, ignoring that he then called it doomed. ## How to answer it Ask for the passage before and after the quote. ## Origin and naming Also called contextomy — a cutting-out. Journalist Milton Mayer coined the word for the practice he documented in Julius Streicher's 'Der Stürmer', which printed shortened Talmud passages so they appeared to say what they did not. Advertising review blurbs are its everyday form: a pan reduced to 'stunning'. ## More places it shows up - A game trailer splashes 'an unforgettable experience' across the screen, cut from a review that continues '— unforgettable for all the wrong reasons.' - A politician's fifteen-second clip of saying 'I am not worried' trends for days; the full sentence was that she was not worried about one minor scenario, and deeply worried about the rest. - A screenshot of a chat circulates at work: 'Fine, let Maria handle everything.' The reply above it, cropped out, was a proposal to rotate on-call duties. - A celebrity's line 'I hate this city' runs as a headline, trimmed from an interview about how much she loves its people but hates its traffic. ## How to spot it - Notice when the quote is too punchy for the occasion it was pulled from. - Notice when the source is never linked, only screenshotted. - Notice when reading the sentence before and after reverses the charge entirely. ## Nearby - [False attribution](https://fallacy.wiki/fallacy/false-attribution.md) - [Straw man](https://fallacy.wiki/fallacy/straw-man.md) - [Fallacy of accent](https://fallacy.wiki/fallacy/accent.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Quoting_out_of_context) - [The Fallacy Files](https://fallacyfiles.org/quotcont.html) # Guilt by association *Also called: Association fallacy* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/guilt-by-association/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/guilt-by-association.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Rejecting a position because a disliked group also holds it. ## In the wild > That group supports the policy, so it must be bad. ## How to answer it Ask whether the shared conclusion rests on shared reasons. Usually it does not. ## Origin and naming Also called the association fallacy, it runs in both directions — guilt by association damns and honor by association flatters. Its modern infamy comes from the McCarthy-era loyalty hearings, where proximity to the accused was treated as evidence against the associate. ## More places it shows up - A city council member's transit plan lands badly after opponents keep noting that a widely despised former mayor once proposed something with the same name. - A founder rejects collaboration with a capable engineer because the engineer's previous employer was a company the founder publicly feuds with. - Commenters declare a charity fundraiser corrupt after discovering that an influencer they dislike promoted it first. - Neighbors oppose a weekend farmers' market because a fringe political group campaigned for a similar one in another district. ## How to spot it - Notice when the case against an idea is a guest list rather than an argument. - Notice when the speaker spends more time naming who agrees than why they agree. - Notice when you feel pushed to recoil from a position before you have heard its reasons. ## Nearby - [Reductio ad Hitlerum](https://fallacy.wiki/fallacy/reductio-ad-hitlerum.md) - [Genetic fallacy](https://fallacy.wiki/fallacy/genetic.md) - [Poisoning the well](https://fallacy.wiki/fallacy/poisoning-well.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Association_fallacy) - [The Fallacy Files](https://fallacyfiles.org/guiltbya.html) # Reductio ad Hitlerum *Also called: Playing the Nazi card* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/reductio-ad-hitlerum/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/reductio-ad-hitlerum.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating a view as refuted because a notorious figure or regime shared it. ## In the wild > A tyrant was a vegetarian, so vegetarianism is suspect. ## How to answer it Point out that villains also breathed air. Shared trait is not shared reasoning. ## Origin and naming Coined by political philosopher Leo Strauss in 1953, playing on 'reductio ad absurdum'. His point: a view is not refuted by naming a monster who agreed with it. The coinage is a joke with teeth — the further the comparison drifts from the actual reasoning, the more it is decoration posing as refutation. ## More places it shows up - A zoning proposal to reduce traffic is dismissed at the town meeting because 'authoritarian regimes loved manipulating traffic flow too.' - A boss's proposal for a daily standup is shot down in a message thread with: 'Dictators love morning roll calls.' - A school uniform policy is mocked on social media with a photo of a historical tyrant in a pressed shirt and the caption 'he liked order too.' - A suggestion to add bicycle lanes to a main road is answered with 'you know who else redesigned the roads,' and the discussion ends there. ## How to spot it - Notice when the rebuttal is a name rather than a reason — and the name is always the same one. - Notice when the comparison is chosen for maximum shock, not for any structural similarity. - Notice when the speaker cannot say what the two positions actually share beyond the shared supporter. ## Nearby - [Guilt by association](https://fallacy.wiki/fallacy/guilt-by-association.md) - [Genetic fallacy](https://fallacy.wiki/fallacy/genetic.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Reductio_ad_Hitlerum) - [Logically Fallacious](https://www.logicallyfallacious.com/logicalfallacies/Reductio-ad-Hitlerum) # Ad lapidem *Also called: Appeal to the stone* - **Cluster:** Attacks on the source — Judging the speaker instead of the argument - **Page:** https://fallacy.wiki/fallacy/ad-lapidem/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/ad-lapidem.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Declaring a claim absurd without giving any reason why. ## In the wild > That is ridiculous, next question. ## How to answer it Ask directly which premise is false and why. ## Origin and naming From the Latin 'argumentum ad lapidem', 'argument to the stone'. The name commemorates Samuel Johnson's famous retort to George Berkeley's immaterialism: as Boswell records it, Johnson kicked a large stone and announced, 'I refute it thus.' Logicians took the kicking as the emblem of a dismissal that performs instead of argues. ## More places it shows up - During the standup, the lead engineer glances at the prototype and says, 'This is nonsense,' then moves to the next agenda item without explaining what breaks. - A panelist on a news show hears the guest's housing proposal, laughs, and says, 'Nobody serious believes that,' and the host moves on. - At the family dinner, an uncle waves off his niece's career plan as 'childish' and asks someone to pass the bread. - In a group chat, someone replies to a linked study with a single laughing emoji, and the thread treats the matter as settled. ## How to spot it - Notice when 'ridiculous' arrives as a full stop rather than the start of an explanation. - Notice when a groan, a laugh, or an emoji is asked to carry the entire weight of a refutation. - Notice when you are left unable to say which part of the claim was rejected, because no part was named. ## Nearby - [Argument from incredulity](https://fallacy.wiki/fallacy/incredulity.md) - [Ad hominem](https://fallacy.wiki/fallacy/ad-hominem.md) - [Fallacy fallacy](https://fallacy.wiki/fallacy/fallacy-fallacy.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_the_stone) - [Logically Fallacious](https://www.logicallyfallacious.com/tools/lp/Bo/LogicalFallacies/10/Appeal_to_the_Stone) ======================================================================== # Emotional pressure Feeling recruited to do the work of evidence ======================================================================== # Appeal to emotion *Also called: Argumentum ad passiones* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/appeal-emotion/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/appeal-emotion.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Using feeling as the main support for a conclusion instead of reasons. ## In the wild > Reject this policy or think of the children who will suffer. ## How to answer it Acknowledge the feeling, then ask what evidence connects it to the conclusion. ## Origin and naming From the Latin 'argumentum ad passiones', 'argument to the passions'. The concept is as old as rhetoric — Aristotle's 'Rhetoric' already treats emotional arousal as one of the three persuasion levers — later catalogued as a fallacy when feeling is made to carry the whole weight of a conclusion. ## More places it shows up - A streaming ad runs sad music over footage of abandoned dogs, then asks you to endorse a shelter policy that was never actually explained. - A manager opens the layoffs meeting with photos of the company's founding days so the room feels too nostalgic to question the numbers. - A talk-show host chokes up while reading a viewer's letter, and the panel treats the policy question as settled. - A comment thread turns a zoning dispute into a referendum on whether you care about your neighbors at all. ## How to spot it - Notice when your pulse changes before any evidence has been produced. - Notice when the conclusion only sounds right while the music is playing. - Notice when asking 'is it true?' is treated as proof you don't care. ## Nearby - [Appeal to fear](https://fallacy.wiki/fallacy/fear.md) - [Appeal to pity](https://fallacy.wiki/fallacy/pity.md) - [Wishful thinking](https://fallacy.wiki/fallacy/wishful-thinking.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_emotion) - [The Fallacy Files](https://www.fallacyfiles.org/emotiona.html) # Appeal to fear *Also called: Scare tactics, argumentum in terrorem* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/fear/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/fear.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Driving acceptance by raising alarm rather than by showing the claim is true. ## In the wild > Sign now or your competitors will crush you. ## How to answer it Ask how likely the feared outcome is and what evidence sets that probability. ## Origin and naming Known in Latin as 'argumentum ad metum' or 'in terrorem' — 'argument to fear'. Logicians catalogued it as the move that wins agreement by inflating dread of the alternative rather than by showing the proposal itself is sound. ## More places it shows up - If we let the junior developers refactor that module, one bug could take the whole platform down — so the rewrite stays with the same two seniors forever. - Switch phone carriers and your number might get lost in the transfer; do you really want to gamble with that? - A campaign ad shows an empty playground and warns that the other candidate's budget will make every neighborhood unsafe. - Skip one gym session on this program and you'll lose all your progress — better lock in the annual plan today. ## How to spot it - Notice when the case for a plan is mostly a horror story about its rivals. - Notice when urgency spikes exactly where the data should be. - Notice when the feared outcome is vivid and detailed while its probability is left blurry. ## Nearby - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) - [Appeal to force](https://fallacy.wiki/fallacy/force.md) - [Slippery slope](https://fallacy.wiki/fallacy/slippery-slope.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_fear) - [The Fallacy Files](https://www.fallacyfiles.org/emotiona.html) # Appeal to pity *Also called: Argumentum ad misericordiam* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/pity/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/pity.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Substituting sympathy for the person in place of support for the claim. ## In the wild > I deserve the promotion, I have had a hard year. ## How to answer it Separate what the person deserves as a person from what the claim earns as a claim. ## Origin and naming From the Latin 'argumentum ad misericordiam', 'argument to mercy'. Logicians gave it a name to mark the substitution of sympathy for support: the hardship is real, but it is not evidence the claim is true. ## More places it shows up - You can't fail my son's project — he's been crying about it all week and his grandmother is ill. - The committee should approve my grant despite the thin methodology; I've been pursuing this research for a decade. - Don't ticket the delivery rider; consider how hard his day has already been. - She should be acquitted — look at what the trial itself has already put her through. ## How to spot it - Notice when the story about suffering arrives exactly where the evidence should be. - Notice when refusing feels like cruelty, even though nothing about the claim changed. - Notice when the person asking has renamed 'unqualified' as 'deserving.' ## Nearby - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) - [Special pleading](https://fallacy.wiki/fallacy/special-pleading.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_pity) - [The Fallacy Files](https://www.fallacyfiles.org/emotiona.html) # Appeal to force *Also called: Argumentum ad baculum* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/force/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/force.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Replacing an argument with a threat of harm or loss. ## In the wild > Agree with the plan or find another job. ## How to answer it Name the threat plainly. Compliance is not agreement, and the claim is still unproven. ## Origin and naming From the Latin 'argumentum ad baculum', 'argument to the stick'. The old name pictures the cudgel behind the speaker: agreement is extracted by threat, and the claim itself is left unargued. ## More places it shows up - Legal suggests we don't discuss the pricing bug publicly — it would complicate things for everyone on this team. - Agree that my essay deserves the top grade, or I'll report the department for how it treated me last year. - The landlord mentions, mid-negotiation about repairs, that lease renewals are entirely at his discretion. - In the group chat, the loudest member reminds everyone he knows who leaked the screenshots before the vote. ## How to spot it - Notice when the argument would collapse if the listener had nothing to lose. - Notice when 'let's keep this friendly' arrives with an inventory of what could go wrong for you. - Notice when the room agrees faster than the reasons deserve. ## Nearby - [Appeal to fear](https://fallacy.wiki/fallacy/fear.md) - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argumentum_ad_baculum) - [The Fallacy Files](https://www.fallacyfiles.org/adbacula.html) # Appeal to flattery *Also called: Apple polishing* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/flattery/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/flattery.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Using praise to secure agreement rather than giving reasons. ## In the wild > A smart person like you will obviously agree. ## How to answer it Take the compliment, then ask for the argument. ## Origin and naming Also called apple polishing or the appeal to pride, sometimes given the Latin 'argumentum ad superbiam'. Rhetoric manuals have long warned that praise slipped in before a request launders the request into something that feels earned. ## More places it shows up - You've got the best eye for copy on this team — proofread my resignation email, and tell me it's not the smartest exit anyone's written. - Only a truly sophisticated investor understands this opportunity; shall I put you down for the premium tier? - A reviewer as fair-minded as you will obviously see my paper deserves acceptance, whatever the formal criteria say. - Dad, you always taught me generosity is a virtue — so lending me money again is really just you living your values. ## How to spot it - Notice when the compliment lands one beat before the request, never after. - Notice when disagreement is framed as falling short of a quality you were just told you have. - Notice when your identity is doing the work that evidence should be doing. ## Nearby - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) - [Snob appeal](https://fallacy.wiki/fallacy/snob-appeal.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_flattery) - [Logically Fallacious](https://www.logicallyfallacious.com/logicalfallacies/Appeal-to-Flattery) # Appeal to spite *Also called: Argumentum ad odium* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/spite/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/spite.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Exploiting resentment toward someone as a reason to reject their position. ## In the wild > Vote against it, remember how they treated you. ## How to answer it Set the grievance aside and evaluate the proposal as if a neutral party had made it. ## Origin and naming From the Latin 'argumentum ad odium', 'argument to hatred' — catalogued by logicians including Gary Curtis of the Fallacy Files. It harvests an existing grudge and spends it as if it were a reason against the grudged party's position. ## More places it shows up - Of course the city council member opposes it — but remember she fired your cousin, so you know what to say at the hearing. - Don't retweet that thread, however accurate; the author humiliated our community three years ago. - Reject the merger proposal — the CFO who drafted it is the same one who cut your department's budget. - He says the experiment design is flawed, but he once competed with your advisor for a grant, so we can ignore the review. ## How to spot it - Notice when the grievance gets a full rehearsal while the proposal gets none. - Notice when your vote is being collected as payback, not as judgment. - Notice when the same idea would be fine from anyone else's mouth. ## Nearby - [Ad hominem](https://fallacy.wiki/fallacy/ad-hominem.md) - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Association_fallacy) - [The Fallacy Files](https://www.fallacyfiles.org/emotiona.html) # Wishful thinking *Also called: Argumentum ad consolationem* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/wishful-thinking/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/wishful-thinking.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Believing something because the alternative is unbearable. ## In the wild > It has to be true, otherwise everything falls apart. ## How to answer it Ask what evidence would exist if the comforting belief were false. ## Origin and naming The psychologist's name for it predates the fallacy label; logicians such as Gary Curtis catalogued its bare form: 'I wish that P, therefore P.' It is the pleasant mirror-image of the appeal to fear — desire doing the work of evidence. ## More places it shows up - The startup will definitely turn profitable next quarter — the alternative would mean telling the team we wasted two years. - My knee can't be seriously injured; the marathon is in six weeks and I've already paid for the trip. - The test results must be a lab mix-up — this treatment was our last option. - Housing prices have to rise again soon; too many friends bought at the peak. ## How to spot it - Notice when 'it has to be true' steps in for 'here is how we know.' - Notice when the argument gets stronger exactly as the stakes of being wrong get worse. - Notice when doubting is treated as pessimism rather than as checking. ## Nearby - [Appeal to consequences](https://fallacy.wiki/fallacy/consequences.md) - [Moralistic fallacy](https://fallacy.wiki/fallacy/moralistic.md) - [Sunk cost fallacy](https://fallacy.wiki/fallacy/sunk-cost.md) - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Wishful_thinking) - [Logically Fallacious](https://www.logicallyfallacious.com/logicalfallacies/Wishful-Thinking) # Appeal to consequences *Also called: Argumentum ad consequentiam* - **Cluster:** Emotional pressure — Feeling recruited to do the work of evidence - **Page:** https://fallacy.wiki/fallacy/consequences/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/consequences.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Judging a claim true or false by whether its implications are pleasant. ## In the wild > If that theory were true it would be terrible, so it is false. ## How to answer it Distinguish what is true from what would be convenient. Reality does not consult us. ## Origin and naming From the Latin 'argumentum ad consequentiam', 'argument to the consequence'. Logicians flagged the move of judging a claim's truth by the pleasantness of its implications, since reality is under no obligation to flatter our preferences. ## More places it shows up - If burnout is really caused by workload, we'd have to redesign the whole team structure — so it must be a resilience problem. - The diagnosis can't be hereditary; that would mean my kids are at risk, and I refuse to believe that. - If rental prices track supply and demand, our favorite housing policy is useless, so the economics must be wrong. - Admitting the campaign failed means the minister resigns tomorrow, therefore the campaign succeeded. ## How to spot it - Notice when the argument answers 'do I want this to be true?' instead of 'is it true?' - Notice when the price of a belief being true is treated as evidence against the belief. - Notice when 'that can't be right' really means 'that would be inconvenient.' ## Nearby - [Wishful thinking](https://fallacy.wiki/fallacy/wishful-thinking.md) - [Moralistic fallacy](https://fallacy.wiki/fallacy/moralistic.md) - [Nirvana fallacy](https://fallacy.wiki/fallacy/nirvana.md) - [Sunk cost fallacy](https://fallacy.wiki/fallacy/sunk-cost.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_consequences) - [The Fallacy Files](https://www.fallacyfiles.org/adconseq.html) ======================================================================== # Distraction and distortion Moving the argument somewhere easier to win ======================================================================== # Straw man *Also called: Misrepresentation* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/straw-man/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/straw-man.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Replacing an opponent's position with a weaker version and refuting that instead. ## In the wild > You want fewer meetings, so you want no communication at all. ## How to answer it Restate the original position in the opponent's own words before answering it. ## Origin and naming A straw man is a training dummy: stuffing in human shape, easy to knock down. The metaphor for attacking a stuffed imitation of your opponent's position — light, flammable, and victorious in every bout — became standard fallacy vocabulary in the twentieth century. ## More places it shows up - She suggested trimming the conference budget; her opponent thundered that she wanted to abolish professional development entirely. - A parent asks for less homework on weeknights; the school newsletter warns against 'parents who don't believe in education'. - A reviewer calls the film's third act slow; defenders respond that critics hate any movie without explosions. - An engineer proposes one weekly on-call rotation instead of two; management replies that some people simply refuse to support the team. ## How to spot it - Notice when the position being demolished sounds dumber than anything the person actually said. - Notice when the rebuttal quotes adjectives but never the original sentence. - Notice when the original speaker's first reply is 'that's not what I said' — and it's true. ## Nearby - [Quoting out of context](https://fallacy.wiki/fallacy/quoting-out-of-context.md) - [Motte and bailey](https://fallacy.wiki/fallacy/motte-bailey.md) - [False equivalence](https://fallacy.wiki/fallacy/false-equivalence.md) - [Red herring](https://fallacy.wiki/fallacy/red-herring.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Straw_man) - [The Fallacy Files](https://www.fallacyfiles.org/strawman.html) # Red herring *Also called: Ignoratio elenchi, irrelevant conclusion* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/red-herring/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/red-herring.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Introducing a side issue that draws attention away from the question at hand. ## In the wild > Why worry about the deadline when the office coffee is terrible? ## How to answer it Return to the original question out loud and park the new topic for later. ## Origin and naming A red herring is a heavily smoked fish with a strong smell. The idiom was popularized by the journalist William Cobbett in 1807, in a story about dragging a kipper across a trail to pull hounds off the scent — the fish that leads the dogs astray. ## More places it shows up - Asked about the hospital's infection rates, the health minister praises the dedication of the nursing staff at length. - Questioned about a product's security flaw, the company's statement explains how many jobs it supports in the region. - A roommate asked about the unpaid rent launches into how rarely anyone else does the dishes. - A council member, pressed on a missing infrastructure budget, delivers a heartfelt speech about the town's proud history. ## How to spot it - Notice when the reply is fluent, emotional and entirely compatible with every possible answer to the question. - Notice when you can't restate the original question from the response you just heard. - Notice when the new topic is easier to defend than the one raised — that's why it was raised. ## Nearby - [Whataboutism](https://fallacy.wiki/fallacy/whataboutism.md) - [Gish gallop](https://fallacy.wiki/fallacy/gish-gallop.md) - [Straw man](https://fallacy.wiki/fallacy/straw-man.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Red_herring) # Loaded question *Also called: Complex question, plurium interrogationum* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/loaded-question/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/loaded-question.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Asking a question that smuggles in an unproven assumption, so any direct answer concedes it. ## In the wild > Have you stopped missing deadlines? ## How to answer it Refuse the frame first, then answer the fair version of the question. ## Origin and naming The trap is ancient — Diogenes Laërtius records the philosopher Menedemus being asked whether he had stopped beating his father. Medieval logicians catalogued it as 'plurium interrogationum', the fallacy of many questions packed into one. ## More places it shows up - A TV host asks a minister: 'When will the government admit it lied about the budget?' — any date offered concedes the lying. - A hiring manager asks a candidate: 'Why did your last team push you out?' — the answer must first survive the premise. - A parent asks a teenager: 'Who were you really texting at 2 a.m.?' — guilty of secrecy whatever the reply. - A commenter demands a scientist explain 'why the data was manipulated' before the manipulation itself has been shown. ## How to spot it - Notice when both 'yes' and 'no' land you in the same place. - Notice when the accusation sits inside the grammar of the question, not in any evidence shown. - Notice when splitting the question in two — 'did it happen?' then 'why?' — is treated as dodging. ## Nearby - [Straw man](https://fallacy.wiki/fallacy/straw-man.md) - [Package deal fallacy](https://fallacy.wiki/fallacy/package-deal.md) - [Amphiboly](https://fallacy.wiki/fallacy/amphiboly.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Loaded_question) - [The Fallacy Files](https://www.fallacyfiles.org/loadques.html) # Gish gallop *Also called: Proof by verbosity, spreading* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/gish-gallop/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/gish-gallop.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Burying the other side under many weak claims at once so none can be answered properly. ## In the wild > Here are thirty objections, refute all of them or I win. ## How to answer it Pick the strongest two, answer them fully, and say why volume is not strength. ## Origin and naming Coined in 1994 by anthropologist Eugenie Scott, who named it after the creationist debater Duane Gish and his habit of sprinting through dozens of weak claims faster than anyone could answer one. The metaphor is the sprint, not the strength, that wins. ## More places it shows up - On a live panel, a guest fires off twelve statistics about crime, the border, schools and taxes in ninety seconds; the moderator has time to fact-check none of them. - A colleague replies to a code review with a 40-bullet comment dump, half of them misreading the diff, and declares the change 'clearly unready'. - A viral video lists fifty 'questions they don't want you to ask' in five minutes — each one a full research project on its own. - In a family argument, one person rattles off every grievance since 2019 — the borrowed car, the forgotten birthday, the group-chat snub — before anyone can address the first. ## How to spot it - Notice when the pace of claims outruns any possibility of checking one. - Notice when the speaker treats an unanswered item — any item — as proof they won. - Notice when correcting one claim gets no reply, because the speaker has already moved to claim nine. ## Nearby - [Argumentum ad nauseam](https://fallacy.wiki/fallacy/ad-nauseam.md) - [Red herring](https://fallacy.wiki/fallacy/red-herring.md) - [Kettle logic](https://fallacy.wiki/fallacy/kettle-logic.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Gish_gallop) # Kettle logic *Also called: Inconsistent defence* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/kettle-logic/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/kettle-logic.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Piling up defences that contradict each other, each undermining the others. ## In the wild > I never borrowed it, it was already broken, and I returned it fine. ## How to answer it List the defences side by side and ask which one is being claimed. ## Origin and naming Named after an example in Freud's 'The Interpretation of Dreams' (1900): a man accused of returning a borrowed kettle damaged replies that he never borrowed it, that it was already broken when he got it, and that he returned it intact. Three defences, each canceling the others. ## More places it shows up - A contractor accused of overbilling insists the invoice was never sent, that the extra hours were pre-approved, and that the client actually asked for the upgrades. - An MP caught at a lobbyist's dinner says he wasn't there, that it was a public fundraiser, and that he paid for his own meal. - A student whose essay matches a website claims she wrote it herself, that great minds think alike, and that the site probably copied her draft. - A driver denies hitting the parked car, adds that the dent was old anyway, and mentions his bumper has been scratched since last winter. ## How to spot it - Notice when each new defence quietly assumes the previous one was false. - Notice when the speaker never commits to a single version of events for more than a sentence. - Notice when you could accept any one excuse only by rejecting the others. ## Nearby - [Ad hoc rescue](https://fallacy.wiki/fallacy/ad-hoc-rescue.md) - [Gish gallop](https://fallacy.wiki/fallacy/gish-gallop.md) - [Special pleading](https://fallacy.wiki/fallacy/special-pleading.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Kettle_logic) # Motte and bailey *Also called: Bait and switch defence* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/motte-bailey/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/motte-bailey.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Advancing a strong controversial claim, then retreating to a modest one when challenged. ## In the wild > I only meant the modest claim, not the strong one I was defending. ## How to answer it Write both versions down and ask which one is being asserted. ## Origin and naming Coined by philosopher Nicholas Shackel in a 2005 paper, named after the medieval castle: the bailey is the desirable but hard-to-defend courtyard, the motte the dreary but impregnable tower. The arguer enjoys the bailey in good times and retreats to the motte under attack. ## More places it shows up - A tech executive tells investors the product will 'end traditional banking'; grilled by a journalist, he says he only meant it offers a handy budgeting tool. - An influencer posts that modern medicine 'cures nothing'; challenged by doctors, she clarifies she just thinks people should eat more vegetables. - A councillor tells a rally the new development 'will destroy the neighbourhood'; at the planning hearing she says she merely worries about parking pressure. - A podcaster claims a rival's research is 'fraudulent, not just wrong'; pressed for evidence, he retreats to 'well, I question his methodology'. ## How to spot it - Notice when a bold claim, once challenged, is reissued as something no one would dispute. - Notice when the speaker oscillates: adventurous in friendly company, modest under scrutiny. - Notice when asking 'so do you stand by the strong version?' produces fog instead of yes or no. ## Nearby - [Straw man](https://fallacy.wiki/fallacy/straw-man.md) - [Moving the goalposts](https://fallacy.wiki/fallacy/moving-goalposts.md) - [Equivocation](https://fallacy.wiki/fallacy/equivocation.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Motte-and-bailey_fallacy) # Moving the goalposts *Also called: Raising the bar* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/moving-goalposts/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/moving-goalposts.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Demanding new evidence once the original demand has been met. ## In the wild > Fine, you proved that, but now prove this too. ## How to answer it Fix the standard in advance and ask what result would count as settling it. ## Origin and naming A sporting metaphor: in football and hockey the goalposts fix what counts as a score. To 'move the goalposts' is to change the standard mid-game so a good shot no longer counts. The image passed from sports reporting into general argument in the late twentieth century. ## More places it shows up - A manager doubts the new hire can handle clients; after a flawless quarter of client work, the new test is whether she can train others to do it. - A skeptic demands one peer-reviewed study on a supplement; shown three, he asks why none ran for longer than five years. - A parent tells a teenager she can go out once her grades improve; when they do, the new condition is that her room must stay clean for a month. - A regulator asks a bank to raise its capital buffer; when the bank complies, the regulator hints real confidence would require a full public audit too. ## How to spot it - Notice when meeting the stated standard produces a new standard instead of agreement. - Notice when 'what would change your mind?' gets no fixed answer. - Notice when each concession is greeted by 'that's nice, but what about...'. ## Nearby - [Ad hoc rescue](https://fallacy.wiki/fallacy/ad-hoc-rescue.md) - [Motte and bailey](https://fallacy.wiki/fallacy/motte-bailey.md) - [Unfalsifiability](https://fallacy.wiki/fallacy/unfalsifiability.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Moving_the_goalposts) # Special pleading *Also called: Unprincipled exception* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/special-pleading/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/special-pleading.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Claiming an exemption from a rule without giving a principled reason for the exemption. ## In the wild > The rule applies to everyone except my case. ## How to answer it Ask for the principle behind the exception and test it on someone else's case. ## Origin and naming From legal 'pleading' — arguing one's case. Special pleading is pleading for your own case to be treated specially: accepting the rule in general while quietly exempting yourself, without a reason that would convince anyone else. ## More places it shows up - Everyone's internet use at work is monitored, says the director — but his own browsing must stay private for 'strategic reasons he can't disclose'. - A diet coach insists calories explain all weight gain, except her own plateau, which is caused by stress hormones. - A columnist demands every public official release their tax returns, but calls requests for his own returns 'harassment with a political agenda'. - Parents enforce a strict no-phone-at-dinner rule, except for dad's phone, because his calls are important. ## How to spot it - Notice when the exception's justification is a quality only the speaker claims to have — importance, sensitivity, special circumstances. - Notice when the same justification, offered by anyone else, would be laughed off. - Notice when asking 'so the rule applies to whom, then?' narrows it to an audience of one. ## Nearby - [Ad hoc rescue](https://fallacy.wiki/fallacy/ad-hoc-rescue.md) - [No true Scotsman](https://fallacy.wiki/fallacy/no-true-scotsman.md) - [Appeal to pity](https://fallacy.wiki/fallacy/pity.md) - [Kettle logic](https://fallacy.wiki/fallacy/kettle-logic.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Special_pleading) # Whataboutism *Also called: Counter-accusation* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/whataboutism/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/whataboutism.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Answering a criticism by pointing at someone else's failing instead of addressing it. ## In the wild > You criticize our delays, what about their delays? ## How to answer it Agree the other case also deserves scrutiny, then return to the one on the table. ## Origin and naming The word became common in Cold War commentary on Soviet rhetoric: criticism of Moscow was met not with a defense but with 'and in America, you are lynching Negroes'. The move itself is the old 'tu quoque' — you too — dressed in a modern uniform. ## More places it shows up - Asked about layoffs at his company, a CEO asks why nobody investigated his competitor's outsourcing. - Confronted about plastic in its packaging, a brand's spokesperson notes that its rival's supply chain is worse. - A fan whose team was caught cheating replies that every club in the league bends the rules. - A parent scolds a child for a broken window; the child asks why nobody punished the neighbor's kid last summer. ## How to spot it - Notice when the answer to an accusation is another accusation, never a fact. - Notice when the counter-charge would still leave the original charge standing even if fully true. - Notice the word 'what about' arriving exactly where an explanation should be. ## Nearby - [Tu quoque](https://fallacy.wiki/fallacy/tu-quoque.md) - [Red herring](https://fallacy.wiki/fallacy/red-herring.md) - [Two wrongs make a right](https://fallacy.wiki/fallacy/two-wrongs.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Whataboutism) # False equivalence *Also called: Flattening differences* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/false-equivalence/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/false-equivalence.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating two cases as comparable when they differ enormously in scale or kind. ## In the wild > One missed a meeting, the other falsified records, both broke rules. ## How to answer it Name the dimension that differs and by how much. ## Origin and naming A modern label from media criticism rather than classical rhetoric. It names the habit of weighing two things on the same scale when their weight differs by orders of magnitude — often to make one side look better or calmer. ## More places it shows up - A network gives 60 seconds to a climate scientist and 60 seconds to a blogger who denies warming, presented as 'both sides of the debate'. - HR announces that the intern who microwaved fish and the manager who altered expense reports both 'violated workplace norms'. - A pundit shrugs that both candidates 'played loose with facts' — one misstated a date, the other invented a riot. - A group chat treats one member's sarcastic remark and another's leaked personal photos as equal offenses against community rules. ## How to spot it - Notice when 'both sides' is said but only one side's specifics get described. - Notice when two items are paired by a shared label — 'broke a rule', 'made a mistake' — that hides the size of each. - Notice when removing one item's details would collapse the comparison entirely. ## Nearby - [False analogy](https://fallacy.wiki/fallacy/false-analogy.md) - [Middle ground](https://fallacy.wiki/fallacy/middle-ground.md) - [Straw man](https://fallacy.wiki/fallacy/straw-man.md) ## Read more - [Wikipedia — List of fallacies](https://en.wikipedia.org/wiki/List_of_fallacies) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Style over substance *Also called: Presentation fallacy* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/style-over-substance/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/style-over-substance.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Letting the polish of a presentation stand in for the quality of its content. ## In the wild > The deck looked polished, so the plan is sound. ## How to answer it Read the argument as plain text with the formatting stripped away. ## Origin and naming A catalogue name rather than a story: it appears in modern fallacy lists (for instance Stephen Downes's guide and the Internet Encyclopedia of Philosophy) for the move that lets confident delivery — eloquence, graphics, credentials, a soothing voice — carry the verdict the argument never earned. ## More places it shows up - The consultancy's roadmap is all serif fonts and tasteful motion; nobody at the meeting can recall the actual plan a week later, but everyone remembers approving it. - A politician's answers meander and contradict, but the voice is calm and the flag is big, and the clip goes viral as 'presidential'. - A food brand's ad shows farmers at sunrise and a cello soundtrack; the ingredient list, which nobody reads, is mostly syrup. - An online course sells itself with cinematic trailers and a charismatic founder; the lessons inside are recycled slides from a decade-old textbook. ## How to spot it - Notice when you feel persuaded but can't state the argument back. - Notice when the strongest memories of a pitch are its music, fonts or voiceover. - Notice when stripping the formatting — reading the transcript, not watching the video — changes your verdict. ## Nearby - [Snob appeal](https://fallacy.wiki/fallacy/snob-appeal.md) - [Appeal to emotion](https://fallacy.wiki/fallacy/appeal-emotion.md) ## Read more - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Ad hoc rescue *Also called: Ad hoc reasoning* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/ad-hoc-rescue/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/ad-hoc-rescue.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Adding an unsupported excuse after the fact to save a claim that failed. ## In the wild > The prediction failed because conditions were unusual that day. ## How to answer it Ask whether the excuse was predicted in advance or invented after the failure. ## Origin and naming From the Latin 'ad hoc', 'for this (purpose only)' — a fix made up for the occasion. Logicians use 'ad hoc rescue' for a patch added after a claim has failed, invented solely to keep the claim alive. ## More places it shows up - The horoscope app said I'd have a lucky week and I got a parking ticket instead — the astrologer replied that my rising sign must have interfered. - A startup's growth forecast missed by half; the founder explains that their kind of company simply can't be measured by ordinary metrics. - A healer's remedy fails to help the patient, so the healer announces it only works on people who truly believe in it. - The watchlist said the stock would double in six months; when it fell, the analyst added that 'smart money' had deliberately suppressed it. ## How to spot it - Notice when the excuse appears only after the failure, never in the original terms. - Notice when the new assumption has no evidence except that it saves the claim. - Notice when each failed prediction spawns exactly one new patch, never a reconsideration. ## Nearby - [Unfalsifiability](https://fallacy.wiki/fallacy/unfalsifiability.md) - [Moving the goalposts](https://fallacy.wiki/fallacy/moving-goalposts.md) - [Kettle logic](https://fallacy.wiki/fallacy/kettle-logic.md) ## Read more - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Unfalsifiability *Also called: Untestable claim* - **Cluster:** Distraction and distortion — Moving the argument somewhere easier to win - **Page:** https://fallacy.wiki/fallacy/unfalsifiability/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/unfalsifiability.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Framing a claim so that no possible observation could count against it. ## In the wild > The force is undetectable by any instrument, but it is real. ## How to answer it Ask what observation would change their mind. If nothing would, the claim is not empirical. ## Origin and naming The term belongs to Karl Popper, who made falsifiability his criterion of science in 'The Logic of Scientific Discovery' (1934). A claim no observation could count against is, on his account, not even wrong — it is untestable by construction. ## More places it shows up - A guru's meditation technique reduces anxiety — and when a trial shows no effect, that proves the participants weren't meditating properly. - A theorist insists a secret cabal runs the market; every piece of contrary evidence just shows how thoroughly the cabal covers its tracks. - A manager claims her leadership raised team morale; the anonymous survey showing otherwise only proves the team can't recognize good leadership yet. - A fortune-teller's predictions are always right: if the event didn't happen, the stars' warning must have helped you avoid it. ## How to spot it - Notice when every outcome — success, failure, silence — is listed as confirmation. - Notice when 'what would prove you wrong?' is answered with a lecture instead of a scenario. - Notice when the claim's defenders describe evidence against it as part of the plan. ## Nearby - [Ad hoc rescue](https://fallacy.wiki/fallacy/ad-hoc-rescue.md) - [Appeal to ignorance](https://fallacy.wiki/fallacy/appeal-ignorance.md) - [Moving the goalposts](https://fallacy.wiki/fallacy/moving-goalposts.md) - [Shifting the burden of proof](https://fallacy.wiki/fallacy/burden-shift.md) ## Read more - [Wikipedia — Falsifiability](https://en.wikipedia.org/wiki/Falsifiability) ======================================================================== # Broken structure The form itself does not carry the conclusion ======================================================================== # Affirming the consequent *Also called: Converse error* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/affirming-consequent/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/affirming-consequent.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is From if A then B, and B is true, wrongly concluding A. Other causes of B are ignored. ## In the wild > If it rains the road is wet; the road is wet, so it rained. ## How to answer it Name one other thing that would produce the same result. ## Origin and naming Named for its shape: the consequent — the 'then' half of a conditional — is affirmed, and from that the 'if' half is concluded. It is the invalid twin of modus ponens, one of the two ways a hypothetical syllogism can misfire. ## More places it shows up - If the servers are overloaded the site is slow; the site is slow this morning, so the servers must be overloaded — and nobody checks the office internet. - Candidates who bluff get caught in interviews; this candidate was caught, so he must have been bluffing. - If the new feature worked, users would upgrade; users upgraded, so the feature works. - When the price drops, demand rises; demand rose last quarter, so the price drop did it. ## How to spot it - Notice when the shape is 'if cause then effect; effect happened; so cause happened' — ask what else produces that effect. - Notice when the argument never asks whether the stated condition was the only path to the result. - Notice when swapping the explanation for another plausible one leaves the premises just as true. ## Nearby - [Denying the antecedent](https://fallacy.wiki/fallacy/denying-antecedent.md) - [Post hoc ergo propter hoc](https://fallacy.wiki/fallacy/post-hoc.md) - [Masked man fallacy](https://fallacy.wiki/fallacy/masked-man.md) - [Affirming a disjunct](https://fallacy.wiki/fallacy/affirming-disjunct.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Affirming_the_consequent) - [Wikipedia: Formal fallacy](https://en.wikipedia.org/wiki/Formal_fallacy) # Denying the antecedent *Also called: Inverse error* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/denying-antecedent/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/denying-antecedent.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is From if A then B, and A is false, wrongly concluding B is false. A may not be the only route to B. ## In the wild > If she trained she would win; she did not train, so she will not win. ## How to answer it Ask whether the conclusion has any other possible cause. ## Origin and naming The invalid mirror of affirming the consequent: the second premise negates the 'if' half of a conditional, and from that the 'then' half is denied. Also called inverse error. Alan Turing planted one deliberately in his 1950 paper on machine intelligence as an example of tempting but broken reasoning. ## More places it shows up - If the merger goes through, the stock will jump; the merger fell through, so the stock won't move — said the day before earnings. - If we advertise, sales will grow; we're not advertising this quarter, so sales can't grow. - If the code has a bug, the tests fail; the tests pass, so the code is fine — ignoring that the tests only cover half the paths. - If interest rates rise, the housing market cools; rates didn't rise, so the market must be heating up. ## How to spot it - Notice when the shape is 'if A then B; A didn't happen; so B won't' — ask whether B has other doors. - Notice when the argument treats one trigger as if it were the only switch wired to the outcome. - Notice when denying the condition is presented as denying the result, even though the result can arrive by another route. ## Nearby - [Affirming the consequent](https://fallacy.wiki/fallacy/affirming-consequent.md) - [Fallacy of the single cause](https://fallacy.wiki/fallacy/single-cause.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Denying_the_antecedent) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Circular reasoning *Also called: Begging the question, petitio principii* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/circular/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/circular.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Assuming in the premises the very thing the argument is supposed to establish. ## In the wild > The rules are correct because the rulebook says so. ## How to answer it Ask for a reason that does not already presuppose the conclusion. ## Origin and naming Aristotle discussed it in the Topics and Prior Analytics as τὸ ἐξ ἀρχῆς αἰτεῖν — 'asking for the initial thing' — a fault in formal debate where one side requests the very thesis at issue. Latin translators rendered it petitio principii, and sixteenth-century English gave us 'begging the question'. ## More places it shows up - This framework is the industry standard because it's the one the industry uses. - The new policy is fair because it treats everything in line with the policy. - You can trust the report — it was approved by the team that wrote it. - This diet works because it produces weight loss, and we know it produces weight loss because it works. ## How to spot it - Notice when stripping the wording down leaves the premise and the conclusion saying the same sentence twice. - Notice when the proof works only for people who already agree with the conclusion. - Notice when asking 'and why is the premise true?' sends you straight back to the conclusion. ## Nearby - [Definist fallacy](https://fallacy.wiki/fallacy/definist.md) - [Package deal fallacy](https://fallacy.wiki/fallacy/package-deal.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Begging_the_question) - [1911 Encyclopædia Britannica (Petitio Principii)](https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Petitio_Principii) # Equivocation *Also called: Ambiguity fallacy* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/equivocation/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/equivocation.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Using one word in two different senses within the same argument. ## In the wild > Laws need lawmakers, so the laws of physics need one. ## How to answer it Define the shared word once and hold that definition through the whole argument. ## Origin and naming Glossed in logic as 'calling two different things by the same name.' It is the lexical half of the ambiguity family — the confusion sits inside a single word rather than in grammar. Sustained across a whole syllogism it becomes the medieval fallacy of the ambiguous middle. ## More places it shows up - The contract says fees are 'reasonable', and both sides sign — years later a lawsuit reveals they agreed on the word, never the amount. - A manager promises the role is 'flexible'; the hire hears remote-friendly, the manager meant available on weekends. - A bank advertises 'free checking for everyone' — free to open, and free of any charge the bank chooses not to label a fee. - A government report calls the program a 'success'; in its first use it means completed on time, in its second, that it worked. ## How to spot it - Notice when the argument still sounds right until you substitute a dictionary definition for the key word at each use. - Notice when agreement happens fast — everyone nodded at the same word for different reasons. - Notice when the contested word carries one sense in the premise and a looser sense in the conclusion. ## Nearby - [Amphiboly](https://fallacy.wiki/fallacy/amphiboly.md) - [Fallacy of accent](https://fallacy.wiki/fallacy/accent.md) - [Definist fallacy](https://fallacy.wiki/fallacy/definist.md) - [Fallacy of four terms](https://fallacy.wiki/fallacy/four-terms.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Equivocation) - [Fallacy Files](https://www.fallacyfiles.org/equivoqu.html) # Definist fallacy *Also called: Persuasive definition* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/definist/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/definist.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Defining a contested term in a way that settles the dispute by wording alone. ## In the wild > Good just means whatever I prefer, so my view is good by definition. ## How to answer it Offer a neutral definition both sides would accept before arguing. ## Origin and naming Charles Stevenson coined 'persuasive definition' in his 1938 paper of the same name, part of his work on the emotive meaning of ethical terms. The definist fallacy is the argumentative move built on it: smuggling a verdict into a definition so the debate is over before it starts. ## More places it shows up - In a performance review dispute, one side defines 'productivity' as lines of code written — and suddenly one engineer is top of the team by definition. - A lobby group defines 'family-friendly content' as content they approve of, then campaigns against everything else as anti-family. - A founder defines 'traction' as whatever metric their startup happens to be growing, and declares the company successful. - In a policy debate, 'reform' is defined as the speaker's own proposal, so any objection is an objection to reform. ## How to spot it - Notice when the definition is delivered mid-argument rather than agreed on before it. - Notice when accepting the definition means losing the debate by default — the wording is doing all the work. - Notice when the same word keeps its emotional charge but quietly changes its content. ## Nearby - [Circular reasoning](https://fallacy.wiki/fallacy/circular.md) - [No true Scotsman](https://fallacy.wiki/fallacy/no-true-scotsman.md) - [Equivocation](https://fallacy.wiki/fallacy/equivocation.md) - [Etymological fallacy](https://fallacy.wiki/fallacy/etymological.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Persuasive_definition) - [Wikipedia (List of fallacies)](https://en.wikipedia.org/wiki/List_of_fallacies) # Reification *Also called: Hypostatisation, concretism* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/reification/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/reification.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating an abstraction as if it were a concrete agent that can act or want. ## In the wild > The market wants stability, so it will act. ## How to answer it Replace the abstraction with the actual people involved and see if the claim survives. ## Origin and naming From the Latin res, 'thing' — to reify is to thing-ify. Alfred North Whitehead named the philosophical version 'the fallacy of misplaced concreteness' in Science and the Modern World (1925); William James had called a nearby habit 'vicious abstractionism' in 1909. Stephen Jay Gould used it as the spine of The Mismeasure of Man, against the idea that intelligence is a measurable thing. ## More places it shows up - The algorithm has decided the applicant is a risk — as if a scoring rule could decide anything on its own. - Science says we evolved for scarcity — as though a research programme could make claims without the researchers inside it. - The brand wants to connect with a younger audience — the brand, apparently, having committee meetings of its own. - History teaches us that empires fall — which absolves everyone who actually pulled the levers. ## How to spot it - Notice when an abstraction — the market, the system, the algorithm — is cast as the subject of a verb of wanting or deciding. - Notice when replacing the abstraction with actual people turns a confident prediction into an obvious question. - Notice when a model or metric is deferred to as if it had a stake in the outcome. ## Nearby - [Ecological fallacy](https://fallacy.wiki/fallacy/ecological.md) - [Fallacy of composition](https://fallacy.wiki/fallacy/composition.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Reification_(fallacy)) - [Fallacies Online](https://fallacies.online/wiki/abstraction/reification) # Undistributed middle *Also called: Shared trait fallacy* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/undistributed-middle/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/undistributed-middle.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Concluding that two things are the same because they share one property. ## In the wild > All engineers use laptops; he uses a laptop, so he is an engineer. ## How to answer it Ask whether the shared property belongs only to the group in question. ## Origin and naming Latin: non distributio medii — 'the middle is not distributed.' In a categorical syllogism the middle term is the hinge that links the two premises; if neither premise applies it to all of its class, the two halves of the argument may be touching different members of that class and never actually meet. Classified by Aristotle in the Prior Analytics and catalogued as a syllogistic fallacy ever since. ## More places it shows up - All committed employees answer late-night messages; Sam answers late-night messages; so Sam is committed. - Every toxic manager reduces team output; this team has low output; so their manager is toxic. - All great chefs love their work; he loves his work; so he's a great chef. - Every successful startup raised venture capital; this startup raised venture capital; so it will succeed. ## How to spot it - Notice when the two halves of the argument both point at the same trait but each could be looking at a different group. - Notice when the conclusion pins one person to a category via a property that half the world shares. - Notice when the premises say 'all As have trait T' and 'this has trait T' — and the conclusion forgets other things have T too. ## Nearby - [Illicit major](https://fallacy.wiki/fallacy/illicit-major.md) - [Affirming the consequent](https://fallacy.wiki/fallacy/affirming-consequent.md) - [Fallacy of composition](https://fallacy.wiki/fallacy/composition.md) - [Existential fallacy](https://fallacy.wiki/fallacy/existential.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Fallacy_of_the_undistributed_middle) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Illicit major *Also called: Illicit process of the major term* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/illicit-major/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/illicit-major.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Drawing a conclusion about all of a category from a premise that covered only part of it. ## In the wild > All cats are mammals; no dogs are cats, so no dogs are mammals. ## How to answer it Check whether the premise really covered every member of the term in the conclusion. ## Origin and naming One of the two classic distribution errors in categorical syllogisms. 'Illicit' marks that the major term — the term in the conclusion's predicate — is claimed about its whole class in the conclusion even though the premises only talked about part of it. It is the structural twin of the illicit minor. ## More places it shows up - All managers are accountable for the budget; no intern is a manager; so no intern is accountable for the budget — while interns sign for petty cash every week. - All certified auditors may sign off on the report; she is not a certified auditor; so she may not sign — overlooking the partner who co-signs. - All encryption keys are stored in the vault; this token is not an encryption key; so it is not in the vault — and it is. - All senior staff have building access; contractors are not senior staff; so contractors can't enter the building — said at the door where they badge in daily. ## How to spot it - Notice when the conclusion makes a sweeping 'no' or 'all' claim about a class the premises never fully covered. - Notice when the pattern is 'all A are B; C is not A; so C is not B' — the shape alone should raise the flag. - Notice when the conclusion excludes something from a class using premises that never said who else belongs to that class. ## Nearby - [Undistributed middle](https://fallacy.wiki/fallacy/undistributed-middle.md) - [Existential fallacy](https://fallacy.wiki/fallacy/existential.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Illicit_major) - [Fallacies Online](https://fallacies.online/wiki/logic/formal_fallacies/fallacies_of_distribution/illicit_process) # Fallacy of four terms *Also called: Quaternio terminorum* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/four-terms/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/four-terms.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is A syllogism that looks valid but uses four terms because one word shifted meaning. ## In the wild > Nothing is better than wisdom; a sandwich is better than nothing; so a sandwich beats wisdom. ## How to answer it Count the distinct concepts, not the distinct words. A valid syllogism has exactly three. ## Origin and naming Quaternio terminorum — 'four terms' — names a syllogism that carries one term too many. A valid categorical syllogism needs exactly three: the two in the conclusion plus the middle that links them. In practice the fourth term is usually smuggled in by one word doing double duty, which makes this fallacy a close cousin of equivocation. ## More places it shows up - Banks deal with money; the river has banks; so the river deals with money. - Justice requires blind judgment; a referee is blind to the replay; so referees are just. - Stars light up the sky; celebrities are stars; so celebrities light up the sky. - Iron is an element; you iron a shirt; so pressing shirts involves chemistry homework. ## How to spot it - Notice when the middle word appears twice but no paraphrase can give it one consistent meaning both times. - Notice when a joke-style riddle is doing the job of an argument — surprise at the wordplay is often the tell. - Notice when the premises are each trivially true and the conclusion absurd; the leak is usually a fourth term. ## Nearby - [Equivocation](https://fallacy.wiki/fallacy/equivocation.md) - [Undistributed middle](https://fallacy.wiki/fallacy/undistributed-middle.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Fallacy_of_four_terms) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Existential fallacy *Also called: Existential instantiation error* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/existential/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/existential.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Concluding that something exists from premises that only describe a category conditionally. ## In the wild > All unicorns are white, so some white things are unicorns. ## How to answer it Ask whether any member of the category has been shown to exist. ## Origin and naming A fallacy of the quantified syllogism: premises that only say every member of a class would have a property are read as proving that some member exists. Medieval logic assumed universal statements carried 'existential import'; Bertrand Russell's 1905 essay 'The Existential Import of Proposition' helped settle the modern, Boolean convention that they do not. ## More places it shows up - All unicorn sightings in the data are fake; therefore some fake sightings are unicorn sightings — the set may simply be empty. - Every overdue invoice gets a penalty fee; therefore some invoices have penalty fees — says the report whose penalty table has zero rows. - All prohibited items are confiscated at the gate; so some items were confiscated today — on a day nothing was prohibited from entering. - All ghost sightings happen at night; therefore some nighttime events are ghost sightings — before establishing a single sighting exists. ## How to spot it - Notice when the conclusion says 'some exist' while every premise only says 'all, if any'. - Notice when swapping the subject for something plainly fictional — dragons, unicorns — leaves the reasoning untouched. - Notice when a database query returns zero rows and the argument still proceeds as if it returned some. ## Nearby - [Illicit major](https://fallacy.wiki/fallacy/illicit-major.md) - [Undistributed middle](https://fallacy.wiki/fallacy/undistributed-middle.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Existential_fallacy) - [The Logic Museum](https://www.logicmuseum.com/wiki/Existential_fallacy) # Affirming a disjunct *Also called: Inclusive or error* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/affirming-disjunct/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/affirming-disjunct.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Assuming that because one option in an or statement is true, the other must be false. ## In the wild > She is in sales or marketing; she is in sales, so she is not in marketing. ## How to answer it Ask whether the or was meant as exclusive. Usually both can hold. ## Origin and naming The name describes the move: one half of an 'or' statement is affirmed, and from that the other half is denied. The error comes from reading 'or' as exclusive — at most one option true — when ordinary usage is often inclusive, and both can hold at once. ## More places it shows up - The outage was caused by the database or the cache; we confirmed the database, so the cache is fine. - He is on leave for family reasons or burnout; HR confirmed family reasons, so it is not burnout. - The delay came from the vendor or from our own approvals; the vendor was late, so our approvals are cleared. - Users churn because of price or features; the survey says price, so the feature roadmap is not the problem. ## How to spot it - Notice when 'or' is quietly being treated as 'exactly one of these,' with no argument for why. - Notice when confirming one option is used to close the investigation instead of narrow it. - Notice when both things being true would explain the evidence better than either alone. ## Nearby - [False dilemma](https://fallacy.wiki/fallacy/false-dilemma.md) - [Affirming the consequent](https://fallacy.wiki/fallacy/affirming-consequent.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Affirming_a_disjunct) - [The Fallacy Files](https://www.fallacyfiles.org/afonedis.html) # Masked man fallacy *Also called: Intensional fallacy, illicit substitution* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/masked-man/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/masked-man.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Substituting identical things inside a statement about belief or knowledge, where it does not hold. ## In the wild > I know my colleague; I do not know the thief; so my colleague is not the thief. ## How to answer it Note that knowing about something is a fact about the knower, not about the thing. ## Origin and naming Named for a stock example in analytic philosophy: I know who my friend is; I don't know who the masked man across the room is — so my friend is not the masked man. The argument fails because it treats 'known by me' as a property of the person, when it is a fact about me. It is an illicit use of Leibniz's law in an epistemic context. ## More places it shows up - The board approved Project Falcon; nobody admitted to approving the leaked plan; so the leaked plan is not Project Falcon — and it was, under a different codename. - Alice knows the sender of the encrypted email; she does not know who runs the anonymous account; so they can't be the same person. - The witness can describe the driver; he cannot describe the defendant; so the defendant was not the driver. - Users trust the official app; users do not trust the new SDK; so the SDK can't be part of the official app — both shipped in the same build. ## How to spot it - Notice when the argument runs 'I know X; I don't know Y; so X isn't Y' — knowledge is a report about the knower, not the known. - Notice when substituting different descriptions of the same person or thing drives the whole conclusion. - Notice when two names or two descriptions are treated as two entities with no evidence beyond ignorance of the link. ## Nearby - [Affirming the consequent](https://fallacy.wiki/fallacy/affirming-consequent.md) - [Equivocation](https://fallacy.wiki/fallacy/equivocation.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Masked-man_fallacy) - [Fallacies Online](https://fallacies.online/wiki/ambiguity/intensional_fallacy) # Amphiboly *Also called: Syntactic ambiguity* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/amphiboly/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/amphiboly.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Drawing a conclusion from a sentence whose grammar allows more than one reading. ## In the wild > The sign said no parking on the grass, so parking on the road is banned too. ## How to answer it Rewrite the sentence in each possible reading and see which one was intended. ## Origin and naming From the Greek amphibolía, 'double throw'. Aristotle treated it in the Sophistical Refutations as ambiguity arising from how words combine, not how they are defined. Modern grammarians renamed it structural or syntactic ambiguity; logicians kept the older name. ## More places it shows up - The memo said 'managers should review contractors weekly' — read as reviewing the contracts, or reviewing the people, and two departments walked away with opposite tasks. - A headline reports 'Police stop drivers leaving airport early' — leaving early, or leaving the airport? The comment section splits on the grammar, not the facts. - The landlord tells tenants 'pets under ten kilograms are fine', and a dispute follows over whether it is the weight or the number of pets. - A coach texts 'let's meet Tuesday after practice people' — one comma's absence schedules a meeting with half the team. ## How to spot it - Notice when the dispute dissolves the moment someone says the sentence aloud with a pause in a different place. - Notice when both sides quote the exact same sentence and each insists the grammar is obvious — that's grammar doing two jobs. - Notice when a modifier dangles between two phrases and each side claims it for their own clause. ## Nearby - [Equivocation](https://fallacy.wiki/fallacy/equivocation.md) - [Fallacy of accent](https://fallacy.wiki/fallacy/accent.md) - [Loaded question](https://fallacy.wiki/fallacy/loaded-question.md) ## Read more - [Wikipedia (Syntactic ambiguity)](https://en.wikipedia.org/wiki/Syntactic_ambiguity) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) # Fallacy of accent *Also called: Prosodic emphasis* - **Cluster:** Broken structure — The form itself does not carry the conclusion - **Page:** https://fallacy.wiki/fallacy/accent/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/accent.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Changing the meaning of a statement by where the stress or emphasis falls. ## In the wild > We should not speak badly of colleagues, implying it is fine to speak badly of others. ## How to answer it Read the sentence flat, with no emphasis, and check what it actually asserts. ## Origin and naming Traced to Aristotle's Sophistical Refutations, which listed it as prosōidía — prosody — later rendered in Latin as accentus. Aristotle's case turned on Greek words that looked identical when written without accents; English keeps the fallacy alive through stress and emphasis instead. ## More places it shows up - An anchor says the minister did not praise the opposition's proposal, with a stress that implies he criticized it — the transcript shows no such thing. - In a headline, 'Manager denies employee was fired for reporting safety issues' reads differently depending on which word the reader's eye dwells on. - A coworker repeats 'I never said SHE handled the budget badly' loudly enough to redirect suspicion onto one person without lying once. - A prosecutor stresses 'You PARKED the car that night' so the jury hears an accusation of intent the witness never made. ## How to spot it - Notice when the written version of what was said is harmless, but the spoken delivery carries the accusation. - Notice when a quote in an article is italicized or bolded mid-sentence to nudge you toward one reading. - Notice when repeating the same sentence out loud with the stress moved changes who looks guilty. ## Nearby - [Quoting out of context](https://fallacy.wiki/fallacy/quoting-out-of-context.md) - [Amphiboly](https://fallacy.wiki/fallacy/amphiboly.md) - [Equivocation](https://fallacy.wiki/fallacy/equivocation.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Fallacy_of_accent) - [Internet Encyclopedia of Philosophy](https://iep.utm.edu/fallacy/) ======================================================================== # False choices and ranges Options and spectrums squeezed out of shape ======================================================================== # False dilemma *Also called: False dichotomy, either or fallacy* - **Cluster:** False choices and ranges — Options and spectrums squeezed out of shape - **Page:** https://fallacy.wiki/fallacy/false-dilemma/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/false-dilemma.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Presenting two options as the only ones when more exist. ## In the wild > Either we ship today or the project is dead. ## How to answer it Name a third option out loud. One is usually enough to break the frame. ## Origin and naming Its simplest form is called the fallacy of bifurcation: one branch is offered, all others are suppressed, and the listener is pushed toward the offered one. No single thinker is credited with naming it; it became a staple of rhetoric and logic handbooks because every negotiation, election, and sales pitch keeps producing new specimens. ## More places it shows up - You are either with the recall or you are defending a defective product. - You either love this city the way it is or you should move somewhere else. - Either we buy the enterprise license or everyone keeps using spreadsheets forever. - A parent says: finish your plate or you clearly do not appreciate what I cook. ## How to spot it - The two options arrive pre-packaged, often with one clearly meant to lose. - The words 'either' and 'or' do heavy lifting, and nobody pauses to check the shelf behind them. - When you suggest a third path, the reply is that it is not one of the options — as if that settled it. ## Nearby - [Middle ground](https://fallacy.wiki/fallacy/middle-ground.md) - [Affirming a disjunct](https://fallacy.wiki/fallacy/affirming-disjunct.md) - [Nirvana fallacy](https://fallacy.wiki/fallacy/nirvana.md) - [Package deal fallacy](https://fallacy.wiki/fallacy/package-deal.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/False_dilemma) - [The Fallacy Files](https://www.fallacyfiles.org/eitheror.html) # Slippery slope *Also called: Camel's nose, domino fallacy* - **Cluster:** False choices and ranges — Options and spectrums squeezed out of shape - **Page:** https://fallacy.wiki/fallacy/slippery-slope/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/slippery-slope.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Claiming one small step must lead to an extreme outcome, without defending the links. ## In the wild > Allow remote Fridays and no one will ever come in again. ## How to answer it Ask for the probability of each link in the chain, then multiply them. ## Origin and naming The image is classical: Cicero has Laelius warn that affairs, once started, glide readily down the path of ruin. In modern logic Alfred Sidgwick described it in 1910 as the 'thin end of a wedge' objection, and English-language debate has kept the slope picture ever since — lawyers prefer a 'parade of horribles', politicians a 'camel's nose in the tent'. ## More places it shows up - If we let the intern present to the client today, next year interns will be running whole accounts. - If the city approves one food truck on this street, the block will turn into a permanent market. - Let them move one deadline and soon no date in the calendar will mean anything. - Allow one chart to skip review and the whole data culture collapses into guesswork. ## How to spot it - The argument jumps from the first step to the last without ever pricing the middle steps. - Each 'and then' is treated as obvious; nobody says how probable any link actually is. - The endpoint is much scarier than the proposal on the table, which is the point of choosing it. ## Nearby - [Appeal to fear](https://fallacy.wiki/fallacy/fear.md) - [Continuum fallacy](https://fallacy.wiki/fallacy/continuum.md) - [Fallacy of the single cause](https://fallacy.wiki/fallacy/single-cause.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Slippery_slope) - [The Fallacy Files](http://www.fallacyfiles.org/slipslop.html) # Middle ground *Also called: Argument to moderation, golden mean fallacy* - **Cluster:** False choices and ranges — Options and spectrums squeezed out of shape - **Page:** https://fallacy.wiki/fallacy/middle-ground/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/middle-ground.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Assuming the truth must lie halfway between two positions. ## In the wild > One side says 10, the other says 0, so the truth is 5. ## How to answer it Ask what supports the midpoint itself. Compromise is a negotiation tool, not evidence. ## Origin and naming Known in Latin as 'argumentum ad temperantiam', the argument to moderation. The Greek idea of the golden mean — Aristotle's virtue sitting between excess and deficiency — was about character, not about splitting factual disputes, and the fallacy is what happens when that ethical picture is borrowed into arithmetic. ## More places it shows up - Marketing wants a launch price of 40, finance wants 20, so the truth is obviously 30. - One report says the project is on time, the other says it is six months late — call it three months and move on. - She says the contract is legal, he says it is void; split the difference and sign half of it. - Two colleagues argue over the headcount, one says five, one says fifteen, so ten is blessed as fact. ## How to spot it - The midpoint arrives without evidence of its own — it is justified only by being between two other numbers. - The two anchors are often chosen so the midpoint lands where the speaker wanted it all along. - Once you notice the average was computed from two opinions rather than from data, the argument is over. ## Nearby - [False equivalence](https://fallacy.wiki/fallacy/false-equivalence.md) - [False dilemma](https://fallacy.wiki/fallacy/false-dilemma.md) - [Continuum fallacy](https://fallacy.wiki/fallacy/continuum.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_to_moderation) - [Wikipedia — false balance](https://en.wikipedia.org/wiki/False_balance) # Continuum fallacy *Also called: Sorites, line drawing fallacy* - **Cluster:** False choices and ranges — Options and spectrums squeezed out of shape - **Page:** https://fallacy.wiki/fallacy/continuum/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/continuum.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Denying a real distinction because no exact boundary can be drawn between its ends. ## In the wild > There is no exact line for baldness, so no one is bald. ## How to answer it Point to a clear case at each end. Vague borders do not erase clear centres. ## Origin and naming Also called the fallacy of the beard or line-drawing fallacy, and tied to the sorites paradox — 'sorites' from the Greek word for heap. The puzzle is attributed to Eubulides of Miletus in the fourth century BCE: take one grain from a heap and it is still a heap, so keep going, and the heap is never not a heap. The fallacy is the confident use of that puzzle to deny distinctions we manage perfectly well in practice. ## More places it shows up - There is no exact salary at which someone becomes rich, so talking about a wealth tax is meaningless. - You cannot say at which sentence a report becomes too long, therefore length limits are arbitrary and unenforceable. - No precise minute separates a late submission from an on-time one, so every deadline is fiction. - No single day marks when a side project became a startup, so calling ours a startup is pure poetry. ## How to spot it - The speaker keeps asking where exactly the line is, as if the lack of an exact answer won the point by default. - Real, clearly distinct cases at the two ends are acknowledged and then quietly ignored. - The demand for a perfect boundary is never applied to the distinctions the speaker actually relies on. ## Nearby - [Nirvana fallacy](https://fallacy.wiki/fallacy/nirvana.md) - [Middle ground](https://fallacy.wiki/fallacy/middle-ground.md) - [Slippery slope](https://fallacy.wiki/fallacy/slippery-slope.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Sorites_paradox) - [The Fallacy Files](https://www.fallacyfiles.org/fallheap.html) # Nirvana fallacy *Also called: Perfect solution fallacy* - **Cluster:** False choices and ranges — Options and spectrums squeezed out of shape - **Page:** https://fallacy.wiki/fallacy/nirvana/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/nirvana.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Rejecting a workable option because it falls short of an ideal that is not available. ## In the wild > The fix does not solve everything, so it is useless. ## How to answer it Compare the option to the real alternatives, not to perfection. ## Origin and naming The term was coined by the economist Harold Demsetz in 1969, criticising policy arguments that compared real institutions to an idealized 'nirvana' rather than to actually available alternatives. The idea itself is older — Voltaire wrote in 1772 that 'the perfect is the enemy of the good' — and the fallacy is what happens when that warning is forgotten. ## More places it shows up - The new ticketing system will not cut support volume to zero, so the migration was a waste. - A helmet does not protect against every injury, so there is no point in making cyclists wear one. - The mentorship program only helped some juniors, so it failed and should be scrapped. - This filter does not catch every scam, so it cannot be part of the answer. ## How to spot it - The option on the table is judged against an imagined one, never against the real alternatives. - Any residual problem, however small, is treated as a verdict on the whole proposal. - Ask what the speaker prefers instead, and the answer either does not exist or quietly scores worse. ## Nearby - [Continuum fallacy](https://fallacy.wiki/fallacy/continuum.md) - [False dilemma](https://fallacy.wiki/fallacy/false-dilemma.md) - [Appeal to consequences](https://fallacy.wiki/fallacy/consequences.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Nirvana_fallacy) ======================================================================== # Causal errors Sequence, coincidence and hindsight read as cause ======================================================================== # Post hoc ergo propter hoc *Also called: After this, therefore because of this* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/post-hoc/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/post-hoc.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating sequence as causation, so whatever came first is taken to have caused what followed. ## In the wild > Sales rose after the rebrand, so the rebrand caused it. ## How to answer it Ask what else changed in the same period, and what sales did before. ## Origin and naming From the Latin 'post hoc ergo propter hoc', 'after this, therefore because of this'. The phrase fossilizes one of the oldest mistakes in reasoning: letting the calendar stand in for a mechanism. It is the template from which most causal fallacies are cut. ## More places it shows up - Ever since we switched to the new coffee supplier, people have been calling in sick less. Good call on the coffee. - I updated my phone and now the battery drains fast — the update broke it. - The city's accident rate dropped the month the new mayor took office; his leadership is clearly working. - Two days after I started the herbal supplements, my headaches stopped. They work. ## How to spot it - The argument leans on a timeline: 'first X, then Y' is offered as the whole case. - No mechanism is proposed — nothing about how X would actually produce Y. - Ask 'what else happened around the same time?' and the answer turns out to be a lot. ## Nearby - [Correlation implies causation](https://fallacy.wiki/fallacy/correlation-causation.md) - [Fallacy of the single cause](https://fallacy.wiki/fallacy/single-cause.md) - [Regression fallacy](https://fallacy.wiki/fallacy/regression.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Post_hoc_ergo_propter_hoc) - [The Fallacy Files](https://www.fallacyfiles.org/posthocf.html) # Correlation implies causation *Also called: Cum hoc ergo propter hoc* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/correlation-causation/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/correlation-causation.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Reading a statistical association as proof that one variable drives the other. ## In the wild > Ice cream sales track drownings, so ice cream drowns people. ## How to answer it Look for a third factor that could produce both, and check whether the direction could be reversed. ## Origin and naming Often given in Latin as 'cum hoc ergo propter hoc', 'with this, therefore because of this'. The warning that correlation is not causation became a fixture of statistics teaching in the twentieth century, alongside famous spurious pairings like ice cream sales and drownings, both driven by hot weather. ## More places it shows up - Schools with more music programs get better test scores, so music must be raising the scores — not the neighborhoods that fund both. - Countries that eat the most chocolate win the most Nobel prizes, so chocolate makes you smarter. - Our most engaged users are also our highest payers, so let's make everyone more engaged and revenue will follow. - Cities with more police have more crime, so adding police clearly causes crime. ## How to spot it - The whole case is 'these two numbers move together' — no experiment, no mechanism, no third variable ruled out. - The arrow only ever points one direction; nobody checks whether Y might be causing X instead. - The claim survives exactly as long as nobody asks what else the two things share. ## Nearby - [Post hoc ergo propter hoc](https://fallacy.wiki/fallacy/post-hoc.md) - [Fallacy of the single cause](https://fallacy.wiki/fallacy/single-cause.md) - [Texas sharpshooter](https://fallacy.wiki/fallacy/texas-sharpshooter.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Correlation_does_not_imply_causation) # Regression fallacy *Also called: Regression to the mean ignored* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/regression/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/regression.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Crediting an intervention for an improvement that was a return to normal after an extreme. ## In the wild > He improved after the pep talk, not because he was having an unusually bad run. ## How to answer it Ask what the baseline was and whether the starting point was unusually high or low. ## Origin and naming Named for the statistical phenomenon identified by Francis Galton in the 1880s: measurements taken after an extreme value drift back toward the average on their own. The fallacy is to hand that drift to whatever happened in between — a lecture, a remedy, a punishment. ## More places it shows up - The coach screamed at the team after their worst loss; they won the next game, so screaming works. - My back pain was at its absolute worst when I booked the chiropractor, and a week later it was much better. - We sent the underperforming branch to a training seminar and their numbers improved the next quarter. - The stock plunged, the CEO gave a defiant interview, and it rebounded — the interview restored confidence. ## How to spot it - The intervention always lands on a peak or a trough — nobody tries the remedy on an ordinary day. - Improvement is measured from the worst point, not from a baseline. - The same 'cure' keeps being rediscovered every time things are unusually bad. ## Nearby - [Post hoc ergo propter hoc](https://fallacy.wiki/fallacy/post-hoc.md) - [Hindsight bias](https://fallacy.wiki/fallacy/hindsight.md) - [Anecdotal evidence](https://fallacy.wiki/fallacy/anecdotal.md) - [Gambler's fallacy](https://fallacy.wiki/fallacy/gamblers.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Regression_toward_the_mean) # Gambler's fallacy *Also called: Monte Carlo fallacy* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/gamblers/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/gamblers.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Believing that independent events correct themselves, so a run makes the opposite due. ## In the wild > Red came up five times, so black is due. ## How to answer it Ask whether the process has any memory. If each trial is independent, the odds do not move. ## Origin and naming Also called the Monte Carlo fallacy, after a night in 1913 when a roulette wheel there landed on black 26 times in a row and gamblers lost heavily betting that red was 'due'. The name survives because it is the cleanest known instance of expecting randomness to keep accounts. ## More places it shows up - I've applied to ten jobs and heard nothing, so the eleventh application is bound to land. - She's had three boys in a row, so this one is almost certainly a girl. - The coin came up heads seven times; I'm putting everything on tails. - Our startup's last four product launches flopped, so by the law of averages the next one has to be a hit. ## How to spot it - Listen for the word 'due' — as if some ledger is being balanced. - The speaker talks about the past as if it were pushing on the future. - No one mentions the mechanism that would change the odds; the run itself is the argument. ## Nearby - [Regression fallacy](https://fallacy.wiki/fallacy/regression.md) - [Base rate neglect](https://fallacy.wiki/fallacy/base-rate.md) - [Slothful induction](https://fallacy.wiki/fallacy/slothful-induction.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Gambler%27s_fallacy) - [The Fallacy Files](https://www.fallacyfiles.org/gamblers.html) # Fallacy of the single cause *Also called: Causal oversimplification* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/single-cause/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/single-cause.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Reducing an outcome with many contributing causes to just one. ## In the wild > The project failed because of the vendor. ## How to answer it List the other contributing factors and ask how much each one moved the outcome. ## Origin and naming Catalogued in logic texts as 'causal oversimplification' or 'reduction': mistaking a single contributing factor for the whole cause. It travels well because one named villain is easier to repeat in a headline than a chain of conditions. ## More places it shows up - Crime rose because of the new prosecutor — never mind the economy, the police budget, or the reporting changes. - The company's decline has one author: the CEO. Not the market shift, the debt load, or the decade of under-investment. - Obesity is a willpower problem. Full stop. - Traffic is bad because bikes were given lanes — said about a corridor where the population doubled in ten years. ## How to spot it - The explanation arrives with one name and a full stop — 'it's X, period.' - Offering a second cause is treated as defending the first one. - The story is told with a villain or a hero, never with proportions. ## Nearby - [Post hoc ergo propter hoc](https://fallacy.wiki/fallacy/post-hoc.md) - [Correlation implies causation](https://fallacy.wiki/fallacy/correlation-causation.md) - [Cherry picking](https://fallacy.wiki/fallacy/cherry-picking.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Fallacy_of_the_single_cause) # Hindsight bias *Also called: Knew it all along effect* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/hindsight/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/hindsight.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating an outcome as having been obvious once you know it happened. ## In the wild > The crash was obvious, anyone could have seen it coming. ## How to answer it Ask what was actually written down or predicted before the event. ## Origin and naming Documented experimentally by psychologist Baruch Fischhoff in 1975, who showed that people told an outcome inflate how predictable it was beforehand — the 'knew-it-all-along phenomenon', also called creeping determinism. It is less an argument than a memory defect that sounds like one. ## More places it shows up - After the election: 'Obviously the underdog was going to win — the signs were everywhere.' Before it: nobody circled those signs. - The startup folded and suddenly every investor says the business model was doomed from day one. - After the layoff announcement, everyone on the team 'always suspected' the company was in trouble. - The bridge collapsed and now every commenter is an engineer who saw the fatigue cracks years ago. ## How to spot it - The certainty is always backward-facing — ask what they said before, and the record is thin. - Nobody can point to a prediction made in advance, only to 'signs' noticed afterward. - The same people who 'knew it' are freshly surprised by the next event. ## Nearby - [Historian's fallacy](https://fallacy.wiki/fallacy/historians.md) - [Regression fallacy](https://fallacy.wiki/fallacy/regression.md) - [Texas sharpshooter](https://fallacy.wiki/fallacy/texas-sharpshooter.md) - [Just-world fallacy](https://fallacy.wiki/fallacy/just-world.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Hindsight_bias) # Historian's fallacy *Also called: Presentism in judgement* - **Cluster:** Causal errors — Sequence, coincidence and hindsight read as cause - **Page:** https://fallacy.wiki/fallacy/historians/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/historians.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Judging past decisions by information that only became available later. ## In the wild > They should have acted, knowing what we know now. ## How to answer it Reconstruct what was actually known at the time of the decision. ## Origin and naming Coined by historian David Hackett Fischer in his 1970 book 'Historians' Fallacies'. His target was colleagues who judged past actors as if they had read the same epilogue we have — assuming decision makers saw events from our vantage, with our information and our outcomes already known. ## More places it shows up - How could the town council approve a design with that concrete? Everyone knows now it degrades — in papers published last year. - The general was incompetent; any fool could see the flank was exposed — on the satellite images we pulled decades later. - Why didn't the founders put that clause in the contract? Clause litigation only became standard practice after the case two years ago. - Judging a 1995 investor for not buying into the internet boom, based on what the internet became by 2010. ## How to spot it - The verdict rests on facts the person could not have had — dates, reports, or norms that postdate the decision. - The critic never says when the warning information actually became available. - Swap in what was known at the time, and the 'obvious' mistake stops being obvious. ## Nearby - [Hindsight bias](https://fallacy.wiki/fallacy/hindsight.md) - [Chronological snobbery](https://fallacy.wiki/fallacy/chronological-snobbery.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Historian%27s_fallacy) ======================================================================== # Part and whole Traits smuggled between members and groups ======================================================================== # Fallacy of composition *Also called: Part to whole error* - **Cluster:** Part and whole — Traits smuggled between members and groups - **Page:** https://fallacy.wiki/fallacy/composition/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/composition.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Inferring that what is true of the parts must be true of the whole they form. ## In the wild > Every player is excellent, so the team is excellent. ## How to answer it Ask whether the property depends on how the parts interact. ## Origin and naming The pattern was treated by Aristotle in 'On Sophistical Refutations', and the modern name 'fallacy of composition' was made standard by Richard Whately in his 1826 'Elements of Logic'. It became famous in economics through the observation that what is wise for one saver (a paradox of thrift) can be ruinous when everyone does it at once. ## More places it shows up - Every feature on the roadmap scored 'high priority', so the release plan is a high-priority release. - Stand up so you can see; everyone in the crowd stands up; the crowd still cannot see better than before. - Each doc page was written clearly on its own, so the migration guide is clear from start to finish. - We saved on every single itinerary by cutting the buffer day, so the whole trip is cheaper with no added risk. ## How to spot it - Notice when the argument jumps from 'each part' to 'the sum' with no mention of how the parts interact. - Notice words like 'overall', 'as a whole', 'the team as a unit' riding on a list of part-level facts. - Notice when scaling up is described as mere repetition, as if everyone can do it at once. ## Nearby - [Fallacy of division](https://fallacy.wiki/fallacy/division.md) - [Ecological fallacy](https://fallacy.wiki/fallacy/ecological.md) - [Undistributed middle](https://fallacy.wiki/fallacy/undistributed-middle.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Fallacy_of_composition) - [The Fallacy Files](https://www.fallacyfiles.org/composit.html) # Fallacy of division *Also called: Whole to part error* - **Cluster:** Part and whole — Traits smuggled between members and groups - **Page:** https://fallacy.wiki/fallacy/division/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/division.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Inferring that what is true of the whole must be true of each of its parts. ## In the wild > The company is profitable, so every department is. ## How to answer it Ask for the breakdown. Aggregates hide their own variation. ## Origin and naming The mirror image of the fallacy of composition, and treated with the same lineage: Aristotle sketched it in 'On Sophistical Refutations', and both were formalised under their current names in nineteenth-century logic textbooks. The atomist move — a whole is coloured, so its tiniest pieces must be — is the classic textbook target. ## More places it shows up - The dataset contains a billion rows, so each row must be huge. - The choir performed superbly tonight, so our new tenor probably covered himself in glory. - The department is described as flat and agile, so every team inside it must run that way. - The podcast won a national award, so my favourite episode must be among the best. ## How to spot it - Notice when a whole-level label ('world-class hospital', 'well-run system') is handed down to a member with no member-level check. - Notice when an aggregate figure (average, total, general reputation) does all the talking and no breakdown is ever asked for. - Notice when the part is described with confidence even though it was never inspected on its own. ## Nearby - [Fallacy of composition](https://fallacy.wiki/fallacy/composition.md) - [Ecological fallacy](https://fallacy.wiki/fallacy/ecological.md) - [Fallacy of accident](https://fallacy.wiki/fallacy/accident.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Fallacy_of_division) - [The Fallacy Files](https://www.fallacyfiles.org/division.html) # Ecological fallacy *Also called: Group to individual inference* - **Cluster:** Part and whole — Traits smuggled between members and groups - **Page:** https://fallacy.wiki/fallacy/ecological/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/ecological.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Drawing a conclusion about an individual from statistics about the group they belong to. ## In the wild > That region is wealthy, so this resident is wealthy. ## How to answer it Ask for individual-level data. Group averages do not describe members. ## Origin and naming Named and pinned down in 1950 by the sociologist William S. Robinson, in a paper that showed correlations computed across groups can be far stronger than the same correlations across individuals — so reading them as the behaviour of individuals is a formal mistake. The name is a historian's artefact: Robinson was studying 'ecological' (region-level) data, not ecology. ## More places it shows up - Employees in four-star-rated companies report more time for deep work, so Sani at a four-star company must be a deep worker. - Neighbourhoods with more green space show lower stress levels, so Mrs. Itani, who lives across from the park, is not stressed. - High-browsing cities produce more reading per person, so this visitor at the book fair is a reader. - Users in industries with the lowest churn pay the highest rates, so this client joining from that industry will accept any price. ## How to spot it - Notice when the only number on the table is a group figure and the conclusion lands on one named person. - Notice averages doing the work that a membership list would do — average salary, average turnout, average score. - Notice when 'the city', 'the region', 'our users' is spoken of as if it were one person. ## Nearby - [Fallacy of division](https://fallacy.wiki/fallacy/division.md) - [Fallacy of composition](https://fallacy.wiki/fallacy/composition.md) - [Base rate neglect](https://fallacy.wiki/fallacy/base-rate.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Ecological_fallacy) - [Simply Psychology](https://www.simplypsychology.org/ecological-fallacy.html) # Fallacy of accident *Also called: Dicto simpliciter, sweeping generalization* - **Cluster:** Part and whole — Traits smuggled between members and groups - **Page:** https://fallacy.wiki/fallacy/accident/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/accident.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Applying a general rule to a case that its rationale was never meant to cover. ## In the wild > Lying is wrong, so never lie to protect someone. ## How to answer it Ask what the rule was for, then check whether this case falls inside that purpose. ## Origin and naming One of the thirteen fallacies listed in Aristotle's 'On Sophistical Refutations', the first systematic catalogue of bad arguments ever written. Its Latin name 'a dicto simpliciter ad dictum secundum quid' means 'from a statement made simply to one made in a qualified sense'. The modern reading is narrower than Aristotle's: applying a rule of thumb to a case its rationale does not cover. ## More places it shows up - Contract terms cannot be renegotiated, so no, we cannot extend a payment deadline for a supplier whose city was hit by an earthquake. - Seatbelts are compulsory on public roads, so the scrapped race car driven on a closed track must have one installed or it cannot compete. - Patients must not be disturbed during consultation hours, so the nurse was written up for interrupting the exam to report a serial number fault on the heart monitor. - Open-plan seating means anyone can take any desk, so the building manager moved the ergonomics workstation assigned by the occupational doctor. ## How to spot it - Notice when a valid rule is quoted verbatim at a case where its purpose visibly breaks. - Notice when the reply treats 'this is the policy' as a complete answer, with no mention of why the policy exists. - Notice when an obvious exception on the table is waved off as irrelevant. ## Nearby - [Fallacy of division](https://fallacy.wiki/fallacy/division.md) - [Hasty generalization](https://fallacy.wiki/fallacy/hasty-generalization.md) - [Special pleading](https://fallacy.wiki/fallacy/special-pleading.md) - [False analogy](https://fallacy.wiki/fallacy/false-analogy.md) ## Read more - [The Fallacy Files](https://www.fallacyfiles.org/accident.html) - [Wikipedia](https://en.wikipedia.org/wiki/Accident_(fallacy)) ======================================================================== # Evidence and sampling The data that was gathered, and the data that was not ======================================================================== # Hasty generalization *Also called: Faulty generalization, insufficient sample* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/hasty-generalization/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/hasty-generalization.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Generalizing from a sample too small or too narrow to support the conclusion. ## In the wild > All three people I asked liked the new logo, so everyone likes it. ## How to answer it Ask how many cases were seen and how they were chosen. ## Origin and naming The medieval logicians knew it as 'secundum quid' — the converse of the fallacy of accident, which over-applies a rule; hasty generalization over-builds one. Modern textbooks call it the fallacy of insufficient sample. Every cliché about 'all politicians' and 'all journalists' is its handiwork. ## More places it shows up - After two bad rides with one app, a commuter declares the whole ride-share industry is a scam. - A manager interviews three candidates from the same university, finds them unprepared, and tells HR to stop shortlisting that school. - A tourist has one rude encounter in a new city and posts that 'people here are unwelcoming'. - A developer's first attempt with a new framework hits a bug, and the team chat concludes the framework is 'not production ready'. ## How to spot it - The conclusion arrives with 'all', 'every', 'always' — and the evidence fits in one hand. - Ask 'how many have you actually seen?' and the answer is usually a number you can count on your fingers. - The sample is self-selected: people the speaker happened to meet, posts the algorithm happened to surface. ## Nearby - [Anecdotal evidence](https://fallacy.wiki/fallacy/anecdotal.md) - [Cherry picking](https://fallacy.wiki/fallacy/cherry-picking.md) - [Fallacy of accident](https://fallacy.wiki/fallacy/accident.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Hasty_generalization) - [The Fallacy Files](https://www.fallacyfiles.org/hastygen.html) # Anecdotal evidence *Also called: Argument from personal experience* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/anecdotal/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/anecdotal.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Preferring a vivid personal story over systematic data. ## In the wild > My uncle smoked and lived to 90, so smoking is safe. ## How to answer it Ask how the story compares to the rate across all cases. ## Origin and naming From the Greek 'anekdotos', 'unpublished' — originally a label for private stories, not courtroom testimony. The term hardened into a warning once science made systematic sampling the standard: one striking case is not a dataset. Popular retellings sometimes call it the 'Volvo fallacy' or the 'person-who' fallacy ('I know a person who...'). ## More places it shows up - The reviews page is full of five-star stories from people who 'never felt better' after the detox tea, so the nutritionist on the panel dismisses the null trial result. - At the family gathering, an uncle waves away sunscreen statistics: his grandfather worked the fields bare-headed for sixty years and 'never had a spot'. - A manager vetoes the remote-work pilot because his cousin's startup 'went fully remote and collapsed in six months'. - Under a viral post about a vaccine side effect, thousands of commenters swap alarming personal stories while the linked study showing rarity goes unclicked. ## How to spot it - The story is always vivid, named, and close — a friend, a relative, 'a guy I know' — while the data is abstract and far away. - Ask 'how many cases are we not hearing?' and the room goes quiet; the sample was never counted, only performed. - The storyteller treats changing the subject to their story as if it answered the statistical question. ## Nearby - [Hasty generalization](https://fallacy.wiki/fallacy/hasty-generalization.md) - [Cherry picking](https://fallacy.wiki/fallacy/cherry-picking.md) - [Survivorship bias](https://fallacy.wiki/fallacy/survivorship.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Anecdotal_evidence) - [The Fallacy Files](https://www.fallacyfiles.org/volvofal.html) # Cherry picking *Also called: Suppressed evidence, incomplete evidence* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/cherry-picking/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/cherry-picking.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Presenting only the data that supports a position while leaving out the rest. ## In the wild > This one quarter was strong, so the strategy works. ## How to answer it Ask for the full series, including the periods that were left out. ## Origin and naming The English idiom 'cherry-pick' comes from fruit picking: take the ripest cherries, leave the rest on the tree. In logic the older name is the fallacy of suppressed evidence — the half-truth offered as the whole truth. It is the standard operating procedure of selective quotation in both advertising and polemic. ## More places it shows up - A supplement ad cites the one small trial that found a benefit and never mentions the four larger trials that found none. - A city official defends a traffic policy by quoting the single winter week with fewer accidents, cropping out the eleven months that came after. - A pundit claims a country's economy is booming by pointing to its stock index, leaving out wages, inflation, and the currency slide. - A product manager announces 'engagement is up' and shows daily active users for the launch week, cutting the chart before the drop that followed. ## How to spot it - The chart ends or starts at a suspiciously neat date. Ask what was on either side of the cut. - Only one study, one week, one metric is ever named. The plural never shows up. - When the missing context is supplied, the story quietly changes tone from triumph to 'well, it depends'. ## Nearby - [Texas sharpshooter](https://fallacy.wiki/fallacy/texas-sharpshooter.md) - [Survivorship bias](https://fallacy.wiki/fallacy/survivorship.md) - [Anecdotal evidence](https://fallacy.wiki/fallacy/anecdotal.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Cherry_picking) - [The Fallacy Files](https://www.fallacyfiles.org/onesided.html) # Survivorship bias *Also called: Selection on the outcome* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/survivorship/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/survivorship.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Studying only the cases that made it through, so the failures never enter the sample. ## In the wild > Every successful founder dropped out, so dropping out helps. ## How to answer it Ask where the failures went, and count them too. ## Origin and naming The classic illustration is Abraham Wald at the Statistical Research Group during the Second World War: asked where to add armour on bombers, he studied the holes on planes that came back and armoured the spots that showed none — those were the planes that never returned. The term 'survivorship bias' now covers any sample that filtered out its own failures. ## More places it shows up - A profile of unicorn founders notes they all worked eighty-hour weeks — with no column for the founders who did the same and folded. - A music magazine asks arena headliners how they made it and takes 'just keep playing anywhere' as career advice. - A property seminar interviews landlords who bought cheap in 2009 and generalizes their timing into a law of markets. - A mutual fund's brochure touts its ten-year returns, calculated over the funds that survived the decade; the shuttered ones are off the books. ## How to spot it - Advice comes only from people whose strategy visibly worked — losers were not invited to the panel. - The dataset 'begins' at a point when failures were already filtered out; nobody quotes the full intake. - Ask 'who tried this and failed?' and the room has no names to give. ## Nearby - [Cherry picking](https://fallacy.wiki/fallacy/cherry-picking.md) - [Anecdotal evidence](https://fallacy.wiki/fallacy/anecdotal.md) - [Base rate neglect](https://fallacy.wiki/fallacy/base-rate.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Survivorship_bias) - [Wikipedia: Abraham Wald](https://en.wikipedia.org/wiki/Abraham_Wald) # Texas sharpshooter *Also called: Clustering illusion, post hoc pattern fitting* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/texas-sharpshooter/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/texas-sharpshooter.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Drawing the target around the hits, so a pattern is defined after the data is seen. ## In the wild > The prediction hit on three of forty forecasts, so it is accurate. ## How to answer it Ask whether the pattern was specified before the data was collected. ## Origin and naming Named for a tall tale about a marksman who fires into the side of a barn, then paints a bullseye around the tightest cluster of holes. The image goes back to John Venn's 1866 Logic of Chance, and the Texas version surfaced in statistical writing in 1977 before Atul Gawande popularized it in 1999. It is the statistical face of apophenia — pattern-seeking after the fact. ## More places it shows up - A newsletter subscriber counts back through an astrologer's fifty weekly forecasts and reports only the three that 'came true'. - An analyst tracks which of his hundred stock picks beat the market and publishes a report titled 'My Seven Proven Winners'. - A city's crime map shows a cluster of incidents in one district and the evening news declares a 'crime corridor' — on data from a single quarter. - A sports bettor posts screenshots of his last three wins and calls himself a sure-thing tipster; the full ledger is private. ## How to spot it - The criterion of success is defined after the results are in — no one wrote down the prediction beforehand. - The denominator is missing: 'three hits' is reported, 'out of how many' is not. - The 'pattern' is always drawn around the data that exists, never where the data was supposed to land. ## Nearby - [Cherry picking](https://fallacy.wiki/fallacy/cherry-picking.md) - [Correlation implies causation](https://fallacy.wiki/fallacy/correlation-causation.md) - [Conjunction fallacy](https://fallacy.wiki/fallacy/conjunction.md) - [Hindsight bias](https://fallacy.wiki/fallacy/hindsight.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Texas_sharpshooter_fallacy) - [The Fallacy Files](https://www.fallacyfiles.org/texsharp.html) # Base rate neglect *Also called: Base rate fallacy* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/base-rate/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/base-rate.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Reading a test result or signal without accounting for how rare the underlying condition is. ## In the wild > The test is 99 percent accurate and positive, so I almost certainly have it. ## How to answer it Ask how common the condition is in the population before reading the result. ## Origin and naming Named 'base rate neglect' by psychologists Amos Tversky and Daniel Kahneman, who showed in the 1970s that people ignore how common a condition actually is once they are handed an individuating detail. The taxi-cab problem became the canonical demonstration. The math behind the correction is Bayes' theorem. ## More places it shows up - A start-up rejects a candidate flagged by a fraud detector that is 95% accurate, forgetting that only 1 in 500 applicants is actually fraudulent — so most flags are false alarms. - A clinic panics over a positive screening whose accuracy is 99%, without mentioning the disease appears in about 1 in 10,000 people. - An airline safety analyst declares an incident pattern 'alarming' after two near-misses in a month, ignoring that the airline runs ten thousand flights a week. - A hiring platform claims its personality quiz predicts success with 90% accuracy, but high performers are so rare in the applicant pool that the quiz labels mostly false positives. ## How to spot it - Only one number is quoted — the accuracy of the test. Nobody says how common the thing being detected is. - The reaction is a shock reaction: 'positive, therefore certain'. Probability of the result never meets probability of the condition. - Ask 'out of a hundred people like this, how many actually have it?' and the whole case needs redoing. ## Nearby - [Conjunction fallacy](https://fallacy.wiki/fallacy/conjunction.md) - [Ecological fallacy](https://fallacy.wiki/fallacy/ecological.md) - [Survivorship bias](https://fallacy.wiki/fallacy/survivorship.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Base_rate_fallacy) - [The Fallacy Files](https://www.fallacyfiles.org/baserate.html) # Conjunction fallacy *Also called: Linda problem* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/conjunction/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/conjunction.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Judging a detailed, specific scenario as more likely than the broader one that contains it. ## In the wild > She is more likely a banker who volunteers than just a banker. ## How to answer it Remember that adding detail can only lower probability, never raise it. ## Origin and naming Documented by Amos Tversky and Daniel Kahneman in 1983 through the 'Linda problem': told that Linda is bright and outspoken, most people rated 'Linda is a bank teller and feminist' as more likely than 'Linda is a bank teller'. The finding held even with statistics students, which is what made it famous. ## More places it shows up - A jury thinks it more likely the defendant 'planned the fraud and covered it up' than just that he 'planned the fraud' — the second story is more damning but strictly less probable. - An investor judges 'the startup will succeed because it rides the AI wave with a brilliant team' as more plausible than 'the startup will succeed'. - A football commentator says the striker is 'more likely to score and celebrate toward the ultras' than just 'more likely to score'. - A dating profile reader concludes a match is 'more likely a surgeon who rescues stray cats' than just 'a surgeon'. ## How to spot it - Adding detail makes the story feel truer — that feeling is exactly the trap. Probability does not reward narrative richness. - The conjunction always contains one 'representative' element that fits the description you were given, and that fit is doing all the work. - If you strip the extra clause out and the claim feels suddenly blander, you were sold a story, not a probability. ## Nearby - [Base rate neglect](https://fallacy.wiki/fallacy/base-rate.md) - [Texas sharpshooter](https://fallacy.wiki/fallacy/texas-sharpshooter.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Conjunction_fallacy) - [The Fallacy Files](https://www.fallacyfiles.org/conjunct.html) # Argument from silence *Also called: Argumentum ex silentio* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/argument-from-silence/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/argument-from-silence.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating the absence of a record as proof that the event did not occur. ## In the wild > No record mentions it, so it never happened. ## How to answer it Ask whether a record would have been expected to exist and survive. ## Origin and naming Latin: 'argumentum ex silentio' — argument from silence. Long used in classical scholarship and biblical studies to describe inferring that an author did not know something because they never mention it. It turns up wherever the gaps in archives are mistaken for gaps in history. ## More places it shows up - HR concludes the harassment complaint 'can't have happened' because there is no email trail — in a company where most conversations happen in hallways. - A commentator argues the ancient city never traded with its neighbours because no surviving tablet lists the goods, ignoring that almost no tablets survived at all. - A manager assumes a departing employee had no issues because their exit interview form was blank — the meeting was cancelled when they dropped off their badge. - A social-media thread insists a politician 'never condemned' an event because no tweet exists, though the condemnation ran in a radio interview that was never transcribed. ## How to spot it - The argument treats an archive as complete: it never asks what records were lost, destroyed, or simply never made. - Notice claims built entirely on the word 'no mention appears' — the form of the argument is the absence itself. - Ask 'would we even expect this to be written down?' and the confident tone wavers. ## Nearby - [Appeal to ignorance](https://fallacy.wiki/fallacy/appeal-ignorance.md) - [Cherry picking](https://fallacy.wiki/fallacy/cherry-picking.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_from_silence) # Slothful induction *Also called: Denying the evidence* - **Cluster:** Evidence and sampling — The data that was gathered, and the data that was not - **Page:** https://fallacy.wiki/fallacy/slothful-induction/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/slothful-induction.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Refusing the conclusion that a strong body of evidence points to. ## In the wild > Ten straight failures, but this time will be different. ## How to answer it Ask what result would be enough, and note how many results have already passed it. ## Origin and naming Named 'slothful induction' to mark the lazy mirror image of the hasty generalization: where one jumps to a conclusion on no evidence, this one refuses to land on one after plenty. Also called the 'appeal to coincidence' — each instance is waved away as chance. It is hasty generalization's stubborn twin. ## More places it shows up - After the fifth contractor invoices late, the client still says each delay must have its own special reason — nothing to conclude here. - A fan base watches its team lose ten straight matches and insists every loss was a referee's mistake or bad weather, never the squad. - An employee has been passed over for promotion four cycles running and calls each decision 'office politics', never looking at the honest feedback. - A town keeps losing power every storm, and the council writes each blackout up as a freak event rather than the grid. ## How to spot it - Every single case gets its own bespoke excuse; no pattern is ever admitted. - Ask 'at what count would you agree this is a pattern?' — the answer keeps sliding. - The word 'coincidence' is doing heavy lifting, and it never pays the bill. ## Nearby - [Gambler's fallacy](https://fallacy.wiki/fallacy/gamblers.md) - [Wishful thinking](https://fallacy.wiki/fallacy/wishful-thinking.md) - [Sunk cost fallacy](https://fallacy.wiki/fallacy/sunk-cost.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Slothful_induction) ======================================================================== # Burden and ignorance Not knowing treated as knowing ======================================================================== # Appeal to ignorance *Also called: Argumentum ad ignorantiam* - **Cluster:** Burden and ignorance — Not knowing treated as knowing - **Page:** https://fallacy.wiki/fallacy/appeal-ignorance/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/appeal-ignorance.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Taking the lack of disproof as proof, or the lack of proof as disproof. ## In the wild > No one has disproven it, so it is true. ## How to answer it Point out that not knowing is a third option, alongside true and false. ## Origin and naming From the Latin 'argumentum ad ignorantiam', 'argument to ignorance', where 'ignorance' means a lack of contrary evidence rather than stupidity. The term was likely coined by John Locke in the late 17th century. It thrives wherever the record is silent: McCarthyism treated an empty file as proof of guilt. ## More places it shows up - Management has never proven the new tracking software is secure, so let's assume it's fine. - There's no evidence that this supplement causes harm, which makes it safe to take daily. - My uncle smoked for forty years and no doctor ever proved cigarettes caused his cough, so the link is invented. - Nobody on the team has shown our release schedule is unrealistic, so it stays as is. ## How to spot it - Notice when silence or a missing record is presented as positive evidence. - Notice when 'you can't prove otherwise' is doing the work of 'here is my proof'. - Notice when the argument ends exactly where the evidence should begin. ## Nearby - [Shifting the burden of proof](https://fallacy.wiki/fallacy/burden-shift.md) - [Argument from silence](https://fallacy.wiki/fallacy/argument-from-silence.md) - [Unfalsifiability](https://fallacy.wiki/fallacy/unfalsifiability.md) - [Argument from incredulity](https://fallacy.wiki/fallacy/incredulity.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_from_ignorance) - [Fallacy Files](https://fallacyfiles.org/ignorant.html) # Shifting the burden of proof *Also called: Onus probandi reversal* - **Cluster:** Burden and ignorance — Not knowing treated as knowing - **Page:** https://fallacy.wiki/fallacy/burden-shift/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/burden-shift.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Requiring the other side to disprove a claim that was asserted without support. ## In the wild > Prove my claim is wrong, otherwise accept it. ## How to answer it Restate that the burden sits with whoever makes the claim. ## Origin and naming The legal tradition states the rule as 'onus probandi incumbit ei qui agit' — the burden of proof lies with the one who asserts, not the one who denies. Reversing that rule is a special case of the appeal to ignorance. Hitchens's razor gives the terse answer: what is asserted without evidence may be dismissed without evidence. ## More places it shows up - I say their candidate is corrupt. Can you prove otherwise? No? Then it's settled. - Our competitor's code is definitely stolen from ours — if not, let them open their repositories and prove it. - You've knocked on this door every week asking for rent evidence. Prove that I didn't already pay. - The new allergen-free formula is dangerous until its makers prove it isn't. ## How to spot it - Notice when 'prove me wrong' arrives before any positive case is made. - Notice when answering the challenge would require you to falsify a claim you never agreed to. - Notice when the debate ends the moment you refuse to play defense. ## Nearby - [Appeal to ignorance](https://fallacy.wiki/fallacy/appeal-ignorance.md) - [Unfalsifiability](https://fallacy.wiki/fallacy/unfalsifiability.md) - [Fallacy fallacy](https://fallacy.wiki/fallacy/fallacy-fallacy.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Burden_of_proof_(philosophy)) # Argument from incredulity *Also called: Personal incredulity, divine fallacy* - **Cluster:** Burden and ignorance — Not knowing treated as knowing - **Page:** https://fallacy.wiki/fallacy/incredulity/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/incredulity.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Concluding that something is false because you cannot imagine how it could be true. ## In the wild > I cannot see how it works, so it cannot. ## How to answer it Note that the limit is on the imagination, not on the world. ## Origin and naming Also called the argument from personal incredulity and, in Robert T. Carroll's Skeptic's Dictionary, the 'divine fallacy' — the leap from unexplained to supernatural. The pattern is ancient: early peoples who could not explain thunder attributed it to a god's rage. The modern name makes the error exact: the limit is in the imagining, not in the world. ## More places it shows up - I can't imagine a bacterium surviving in boiling acid, so that study can't be right. - The merger numbers don't make sense to me after one read, so the analyst must be cooking the books. - I can't picture how this building would survive an earthquake with columns that thin. The architects are gambling with lives. - Evolution says a fish turned into a bird? I just can't see it, so scratch the whole theory. ## How to spot it - Notice when disbelief itself is offered as the sole ground for rejection. - Notice when the speaker substitutes a hard-to-picture image for an actual mechanism. - Notice when the demand for an explanation arrives after the verdict, not before it. ## Nearby - [Ad lapidem](https://fallacy.wiki/fallacy/ad-lapidem.md) - [Appeal to ignorance](https://fallacy.wiki/fallacy/appeal-ignorance.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_from_incredulity) ======================================================================== # Values and premises Hidden value claims doing the arguing ======================================================================== # Is-ought fallacy *Also called: Naturalistic fallacy, Hume's guillotine* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/is-ought/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/is-ought.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Deriving a claim about what should be from a claim about what is. ## In the wild > It happens naturally, so it should happen. ## How to answer it Ask which value premise is doing the work, and whether it is defensible. ## Origin and naming David Hume raised the question in A Treatise of Human Nature (1739–40), book III, where he watched moralists slide from 'is' and 'is not' to 'ought' and 'ought not' without explaining the step. 'Hume's guillotine' — the name for the thesis that no ethical conclusion follows from purely descriptive premises — was coined by Max Black in 1964. ## More places it shows up - 'Startups that move fast outcompete cautious ones' gets quoted in a deck, and by slide four the fact has quietly become a duty: 'So we should ship without reviews.' - A panel on inequality cites data showing top earners work more hours, and someone concludes the wage gap is therefore just. - Observing that rural communities rely on cars, the minister rules out transit funding: people 'don't want' alternatives, judging by what they currently do. - A mother defends the old parenting manual because children raised on it 'turned out fine' — a record of what happened, offered as a rule for what should. ## How to spot it - The sentence starts with data and ends with a prescription, and the verb tense does the smuggling. - Ask which value premise was added between the facts and the 'should' — the speaker often can't find it because they never wrote it down. - Listen for the passive 'that's just how things are' asked to carry the weight of a rule. ## Nearby - [Appeal to nature](https://fallacy.wiki/fallacy/appeal-nature.md) - [Moralistic fallacy](https://fallacy.wiki/fallacy/moralistic.md) - [Just-world fallacy](https://fallacy.wiki/fallacy/just-world.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Is%E2%80%93ought_problem) - [Stanford Encyclopedia of Philosophy](https://plato.stanford.edu/entries/hume-moral/) # Appeal to nature *Also called: Natural is better* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/appeal-nature/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/appeal-nature.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating natural as a synonym for good, safe, or right. ## In the wild > It is natural, so it is safe. ## How to answer it Name a natural thing that is harmful. The category does not track safety. ## Origin and naming The habit is ancient — Greek writers treated the 'laws of nature' as norms for conduct, not just descriptions of it. As a named fallacy it belongs to the twentieth century, when philosophers disentangled it from G. E. Moore's related 'naturalistic fallacy' in Principia Ethica (1903). ## More places it shows up - The supplement ad lingers on rainforest leaves and calls the capsule 'completely natural' — as if the source of an ingredient settles the question of what it does to you. - In the school-board debate a parent argues against the new canteen menu because the vegetables are 'grown in a lab', not because of anything on the nutrition sheet. - A colleague insists the three-day hike with no phone signal must be 'healthier' than the gym because it's 'how humans evolved to move'. - In a parenting forum, someone dismisses formula milk out of hand because breastfeeding is 'what nature intended', with no glance at the family's actual situation. ## How to spot it - Listen for 'natural' doing the whole job of 'good' with no property named in between. - The argument never says what the natural thing actually does — only where it comes from. - Ask whether the speaker would accept the same logic applied to arsenic or lightning, both rich in nature. ## Nearby - [Is-ought fallacy](https://fallacy.wiki/fallacy/is-ought.md) - [Appeal to tradition](https://fallacy.wiki/fallacy/tradition.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Appeal_to_nature) - [Fallacy Files](https://fallacyfiles.org/adnature.html) # No true Scotsman *Also called: Appeal to purity* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/no-true-scotsman/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/no-true-scotsman.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Redefining a category mid-argument to exclude any counterexample. ## In the wild > No real engineer writes code like that. ## How to answer it Fix the definition before looking at examples, and hold it fixed after. ## Origin and naming Philosopher Antony Flew described the move in God & Philosophy (1966) and returned to it in Thinking About Thinking (1975), where his example became the name: the Scot who reads of a savage crime in Aberdeen and, rather than concede, shifts to 'no true Scotsman would do such a thing'. ## More places it shows up - A member of the coding forum says professional developers never use tabs; shown a celebrated engineer who does, they reply that she 'isn't really a professional in the craft sense'. - When the peaceful-demonstration story includes a few broken windows, the organizer insists those 'weren't actual marchers' — before anyone has asked who they were. - A football fan claims no true supporter would leave the stadium early; the empty seats at minute 85 are reclassified as tourists. - In a book club, a reader defends the genre against a bad review: the disappointing novel 'isn't real science fiction anyway'. ## How to spot it - A counterexample appears and the category shrinks on the spot to stay safe. - Notice the adjective doing the rescue: 'real', 'true', 'genuine', 'authentic' — inserted only after the fact. - Ask for the membership criteria stated before the example, and the definition has already been quietly rewritten. ## Nearby - [Definist fallacy](https://fallacy.wiki/fallacy/definist.md) - [Special pleading](https://fallacy.wiki/fallacy/special-pleading.md) - [Ad hoc rescue](https://fallacy.wiki/fallacy/ad-hoc-rescue.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/No_true_Scotsman) # False analogy *Also called: Weak analogy, faulty comparison* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/false-analogy/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/false-analogy.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Transferring a conclusion between two cases that differ in the respect that matters. ## In the wild > A company is like a family, so no one should ever be let go. ## How to answer it Name the feature the analogy depends on, then check whether both cases really share it. ## Origin and naming The phrase 'false analogy' is credited to John Stuart Mill, one of the first to examine analogical reasoning in detail — his textbook case was inferring laziness from a lazy sibling. Analogy itself stays indispensable in argument; the fallacy begins where the cases diverge on the point carrying the conclusion. ## More places it shows up - 'The brain is like a muscle — skip leg day and it atrophies' gets used to justify eight hours of mandatory trivia training, though memory and muscle differ in exactly the ways that matter here. - A columnist argues a nation should run its budget like a household — no borrowing, ever — ignoring that governments print the currency households merely spend. - In a meeting, a manager compares the ten-person startup to a Formula 1 pit crew and demands the same two-second release cycle. - A viral post likens social-media moderation to burning books, though deleting a post removes nothing the author can keep elsewhere. ## How to spot it - The analogy is vivid and the application instant; nobody pauses to name the shared feature. - Ask 'in what respect exactly are they alike?' and the answer restates the metaphor in newer clothes. - The comparison earns its warmth in one case and spends it in the other — check where the load bearing actually sits. ## Nearby - [False equivalence](https://fallacy.wiki/fallacy/false-equivalence.md) - [Fallacy of accident](https://fallacy.wiki/fallacy/accident.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_from_analogy#False_analogy) # Sunk cost fallacy *Also called: Concorde fallacy, escalation of commitment* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/sunk-cost/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/sunk-cost.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Letting money or effort already spent justify continuing, when only future returns matter. ## In the wild > We have spent two years on it, so we must finish. ## How to answer it Ask what you would decide if you were starting from today with nothing spent. ## Origin and naming Hal Arkes and Catherine Blumer documented the effect in 1985 ('The Psychology of Sunk Cost') as the tendency to keep investing once money, effort, or time has been spent. It is also called the Concorde fallacy, after the British and French governments that kept funding the supersonic jet long after its commercial case had collapsed. ## More places it shows up - The startup has burned eighteen months and two funding rounds on a feature nobody uses, and the board approves a third because 'we're too far in to stop now'. - A reader finishes the thousand-page fantasy series they stopped enjoying at book two, because abandoning it now would waste the first eight hundred pages. - In the meeting about the failing contractor, the project lead argues to keep them through phase three — 'we've already trained them on our systems'. - He holds the losing stock from $40 down to $4, telling his broker he 'can't sell at a loss' — as if the $36 were still on the table to be recovered. ## How to spot it - The justification is all in the past tense: money spent, years invested, effort poured — nothing about what comes next. - Ask 'if you were starting from today, would you choose this?' and the answer changes the subject to what's already gone. - The counterargument is always offered as proof of commitment, not as evidence the commitment is working. ## Nearby - [Wishful thinking](https://fallacy.wiki/fallacy/wishful-thinking.md) - [Slothful induction](https://fallacy.wiki/fallacy/slothful-induction.md) - [Appeal to consequences](https://fallacy.wiki/fallacy/consequences.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Sunk_cost) - [The Decision Lab](https://thedecisionlab.com/biases/the-sunk-cost-fallacy) # Fallacy fallacy *Also called: Argumentum ad logicam* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/fallacy-fallacy/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/fallacy-fallacy.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Concluding a claim is false because the argument given for it was flawed. ## In the wild > Your argument had a fallacy, so your conclusion is false. ## How to answer it Separate the argument from the claim. A bad argument leaves the claim unproven, not refuted. ## Origin and naming Catalogued as argumentum ad logicam, 'the argument to logic', and nicknamed the fallacist's fallacy; David Hackett Fischer gave it that name in Historians' Fallacies (1970), and Nigel Warburton lists it as the 'bad reasons fallacy' in Thinking from A to Z. The mistake is to confuse a broken proof with a broken claim. ## More places it shows up - Her thread argued for the vaccine mandate from a study that turned out to be retracted, so he declared the mandate itself 'debunked' and moved on. - The defense attorney's closing leaned on an emotional appeal, and the jury decided the client must therefore be guilty. - A reviewer spots a straw man in the op-ed and dismisses not just the column but the policy it was arguing for. - Mid-debate, someone calls out a tu quoque and treats the buzzer as a referee's whistle — point scored, position false. ## How to spot it - The victory lap follows the fallacy call, with nothing further offered against the claim itself. - The response audits the argument's form and never touches what the claim is about. - Ask 'so is the conclusion wrong, or just this defense of it?' and watch the speaker conflate the two again. ## Nearby - [Shifting the burden of proof](https://fallacy.wiki/fallacy/burden-shift.md) - [Ad lapidem](https://fallacy.wiki/fallacy/ad-lapidem.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Argument_from_fallacy) - [Fallacy Files](https://fallacyfiles.org/fallfall.html) # Moralistic fallacy *Also called: Reverse naturalistic fallacy* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/moralistic/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/moralistic.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Concluding that something is not the case because it ought not to be. ## In the wild > It ought not be true, so it is not. ## How to answer it Keep the description and the evaluation in separate columns. ## Origin and naming The moralistic fallacy is the naturalistic fallacy's mirror: where one argues from 'is' to 'ought', the other argues from 'ought' to 'is'. Bernard Davis named it in its current sense in a 1978 Nature article resisting calls to restrict basic biological research on the grounds that its findings might be misused — 'knowledge cannot be ensured against misuse, and misuse cannot falsify knowledge.' ## More places it shows up - Asked whether a trait shows any heritable component, the committee refuses to fund the study: the question 'shouldn't have an answer', so it can't. - A manager insists the team's workload is fair because an unfair distribution would demoralize everyone — the demoralization is the evidence. - In the comments under a crime stat, someone declares the figure must be fabricated because publishing it would harm the community's reputation. - A parent dismisses the diagnosis because accepting it would mean their child 'was born flawed', which a loving family doesn't do. ## How to spot it - The answer arrives before the question is investigated, and the investigation is the thing being blocked. - Notice the grammar: 'it can't be true' where the evidence would normally sit. - The test is what the speaker would do with contrary data — if the answer is 'it must be wrong', you have found it. ## Nearby - [Is-ought fallacy](https://fallacy.wiki/fallacy/is-ought.md) - [Wishful thinking](https://fallacy.wiki/fallacy/wishful-thinking.md) - [Appeal to consequences](https://fallacy.wiki/fallacy/consequences.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Moralistic_fallacy) # Just-world fallacy *Also called: Belief in a just world* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/just-world/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/just-world.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Assuming outcomes are deserved, so misfortune implies fault. ## In the wild > He lost his job, so he must have deserved it. ## How to answer it Ask what role chance, timing, and circumstance played in the outcome. ## Origin and naming Psychologist Melvin Lerner named the belief in a just world in the early 1960s and documented it at the University of Kansas in 1966, where observers of a suffering victim, unable to help, came to derogate her instead. He summarized the work in The Belief in a Just World: A Fundamental Delusion (1980). ## More places it shows up - Reading about the investor who lost everything to a fraud, the comments decide he was greedy and the scheme 'only takes in people who want shortcuts'. - After the layoff, colleagues explain the cut among themselves: 'She never really fit the culture' — a verdict that arrives only after the verdict did. - A neighbor hears about the car accident on the highway and immediately knows the driver must have been speeding. - On a help forum, someone who was locked out of their account by a platform error is told to check what they did to trigger the flag. ## How to spot it - The story rearranges itself so the victim's character arrives just in time to explain the event. - The search for what they did wrong starts only after the bad thing happened — the outcome picks the evidence. - Ask what role chance played and the reply treats luck as an accusation, not a factor. ## Nearby - [Is-ought fallacy](https://fallacy.wiki/fallacy/is-ought.md) - [Hindsight bias](https://fallacy.wiki/fallacy/hindsight.md) - [Fallacy of the single cause](https://fallacy.wiki/fallacy/single-cause.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Just-world_fallacy) # Two wrongs make a right *Also called: Retaliation as justification* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/two-wrongs/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/two-wrongs.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Justifying a wrong by pointing to a comparable wrong done by someone else. ## In the wild > They cut corners, so we can too. ## How to answer it Ask what makes the act acceptable in itself, independent of what others did. ## Origin and naming The earliest recorded version of the phrase appears in a 1734 poem in The London Magazine — 'two wrongs infer one right'. As a fallacy of relevance it is now counted among the most common in Western philosophy: an injury answered by naming another injury, as if the second canceled the first. ## More places it shows up - Caught selling user data, the app's spokesperson notes that every major platform does it — and the press release ends there, as if the census were a defense. - After the foul is called, the midfielder appeals to the referee: their striker took a dive in the first half, so this one evens the ledger. - In a custody dispute, both parents produce lists of the other's missed pickups, each treating the other's record as a license for their own. - During the contract negotiation, one side leaks the counterpart's memo and answers the outcry with the last leak, three years ago, in the other direction. ## How to spot it - The reply relocates the conversation — your accusation is answered with someone else's biography. - The scale in the metaphor: the second wrong is offered to 'balance' the first, and nothing else about the act is defended. - Ask whether the response would stand if the other party had never existed; the pause tells you the justification was borrowed. ## Nearby - [Whataboutism](https://fallacy.wiki/fallacy/whataboutism.md) - [Tu quoque](https://fallacy.wiki/fallacy/tu-quoque.md) - [Appeal to common practice](https://fallacy.wiki/fallacy/common-practice.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Two_wrongs_don%27t_make_a_right) - [Fallacy Files](https://fallacyfiles.org/twowrong.html) # Etymological fallacy *Also called: Appeal to word origin* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/etymological/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/etymological.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Insisting a word's original meaning is its correct meaning today. ## In the wild > The word originally meant X, so that is what it really means. ## How to answer it Ask how the word is used now by the people who use it. ## Origin and naming A standard label in modern linguistics: Andrew Sihler's Language History (2000) names the mistake of reading a word's past into its present, and Kenneth Wilson's Columbia Guide to Standard American English (1993) catalogues it among usage errors. It presumes words are answers to their roots, when they are answers to their users. ## More places it shows up - In a comment thread, someone corrects the journalist: 'Decimate originally meant to kill one in ten, so using it for a 40% staff cut is just wrong.' - A style guide bans 'fulsome praise' because fulsome 'really means' excessive and insincere, though the writer meant what every current reader reads. - In a language forum, a user insists 'hysteria' can only ever refer to the uterine condition it was coined for, and any other use is 'illiterate'. - During the rebrand meeting, someone objects that 'awful' once meant 'full of awe', so the new slogan 'awfully good coffee' contradicts itself. ## How to spot it - The correction reaches for a dictionary's history column and skips the usage column. - The argument would hold at any point in history, which is another way of saying it holds at none. - Notice the pivot from 'used to mean' to 'really means' with no bridge in between. ## Nearby - [Genetic fallacy](https://fallacy.wiki/fallacy/genetic.md) - [Definist fallacy](https://fallacy.wiki/fallacy/definist.md) - [Chronological snobbery](https://fallacy.wiki/fallacy/chronological-snobbery.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Etymological_fallacy) # Chronological snobbery *Also called: Appeal to the modern* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/chronological-snobbery/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/chronological-snobbery.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Rejecting an idea because it belongs to an earlier era. ## In the wild > That was believed in the past, so it is wrong. ## How to answer it Ask what specifically was shown to be false, and by what evidence. ## Origin and naming The phrase was coined by C. S. Lewis and Owen Barfield and first appeared in print in Lewis's 1955 autobiography Surprised by Joy, where he defined it as 'the uncritical acceptance of the intellectual climate common to our own age, and the assumption that whatever has gone out of date is on that account discredited.' Lewis credited Barfield with curing him of it. ## More places it shows up - Asked why the board ignores a fifty-year-old management text, the consultant shrugs: 'Nobody reads Drucker seriously anymore — we've moved past that.' - A developer dismisses the design patterns book from 1994 in favor of a thread posted last week, because 'software moves fast' and old advice must be stale. - A student skips the philosophy reading because it predates the internet: 'How could anyone before smartphones understand attention?' - On a podcast the host waves off supply-side economics as 'eighties thinking' without touching what the theory actually claims. ## How to spot it - The objection names a decade when it should name a counter-argument. - The shelf-life framing: the idea is 'dated' rather than 'wrong', and nobody can say which experiment disproved it. - Ask what specifically was shown false, and the room goes quiet — only the calendar was consulted. ## Nearby - [Appeal to novelty](https://fallacy.wiki/fallacy/novelty.md) - [Appeal to tradition](https://fallacy.wiki/fallacy/tradition.md) - [Etymological fallacy](https://fallacy.wiki/fallacy/etymological.md) - [Historian's fallacy](https://fallacy.wiki/fallacy/historians.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Chronological_snobbery) # Package deal fallacy *Also called: False conjunction of positions* - **Cluster:** Values and premises — Hidden value claims doing the arguing - **Page:** https://fallacy.wiki/fallacy/package-deal/ - **In Arabic:** https://fallacy.wiki/ar/fallacy/package-deal.md - **Licence:** CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/ ## What it is Treating separable positions as a bundle that must be accepted or rejected together. ## In the wild > If you accept the first point you must accept the rest. ## How to answer it Split the bundle and take a position on each item separately. ## Origin and naming Meir Sternberg staked a claim to the name in Hebrews between Cultures (1998), describing a 'tendency to overconnection among essentially independent variables'. Ayn Rand had used the same phrase earlier for a related but distinct error — bundling dissimilar concepts as if they were interchangeable — in Philosophy: Who Needs It. ## More places it shows up - 'You can't support the carbon tax and fly to conferences' treats a policy view and a travel habit as one contract, each a referendum on the other. - A hiring manager assumes that if the candidate is strong on system design they must also lead meetings well, and is puzzled by the performance review. - In a family argument, accepting the medical advice on the vaccine is presented as signing on to everything the health ministry has ever said. - A student is told that valuing labor rights means opposing free trade — the two come as a set menu, no substitutions. ## How to spot it - Listen for the word 'then' doing the work of an argument: 'if you accept A, then B follows' — with no link shown. - The speaker treats your partial agreement as full subscription. - Try splitting the bundle: if the response is 'you can't have one without the other' without a reason, you've found the package. ## Nearby - [False dilemma](https://fallacy.wiki/fallacy/false-dilemma.md) - [Loaded question](https://fallacy.wiki/fallacy/loaded-question.md) - [Circular reasoning](https://fallacy.wiki/fallacy/circular.md) ## Read more - [Wikipedia](https://en.wikipedia.org/wiki/Package-deal_fallacy) --- From fallacy.wiki — a bilingual field guide to 91 logical fallacies, published by phi holdings. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/): reuse freely with attribution to fallacy.wiki.