Don't see how there really should be anything funny in sexual molestation. No matter how stupid the victim was.
And for the record I too find your other examples (though they aren't really comparable to someone’s trust and physical bodies being violated) funny.
Guess I know too many women who have been seriously hurt by abuse. But whether it was their poor judgment or not that led to it, I don't feel the need to point and laugh and convince myself I'm superior.