Some Fallacies of Belief.

1. Believe X because it would be nice if X were true.

2. Believe X because evidence for the alternative, Y, is not overwhelmingly strong (even though it is stronger than for X).

3. Believe X because smart people believe X, even though I know they haven't thought about it.

4. Believe X because most people believe X, even though I have no respect for their judgement.

These are all surprisingly tempting.