I'm surprised nobody has mentioned the interesting parallel with religion here. Belief in a deity is also --in some eyes-- totally irrational. It can cause similar harm and sometimes also divides families, e.g. when people want to 'get out': Jehovas witnesses, scientology, ...
Let's face it, collectively, we're not as rational as we like to believe.
Let's face it, collectively, we're not as rational as we like to believe.