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.
Emotional pressure
Wishful thinking
Also called Argumentum ad consolationem
In depth
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.