It makes life much easier to deal with. What did you expect, he's stupid. You shouldn't be surprised, they're stupid. Of course they did, they're stupid. Well, that's the kind of behavior you'd expect from a stupid person.
Stupidity strikes again.
Life is a lot easier to cope with when you accept that everything bad happens because of stupidity. There's a little more to this philosophy than to simply call everyone stupid, however. Something stupid happens. Everyone is stupid. A violent response is out.