Wishful thinking
Believing something because you want it to be true.
How to spot it
Is hope being treated as evidence?
Example
“It'll definitely work out. It has to.”
How to answer it
Ask what would be different if you were wrong, and check that.
Related
- Appeal to consequences: Judging whether something is true by whether its results are pleasant.
- Sunk cost: Continuing something because of what you've already put into it, not because of what it will return.