There's an interesting segment in this psychology lecture about irrationality that seems related:
http://www.youtube.com/watch?v=i5IrSEIPdwk#t=44m36s
There is some advantage to being irrational, to having a temper.
Because if you have a temper and you're known to be irrational, people
are forced, by dint of your irrationality, to treat you better. Who am
I going to take from? The person who's extremely reasonable or the
person who has a hair-trigger temper? Well, I'm going to pick on a
reasonable person because the unreasonable person might do unreasonable
things. And this is faintly paradoxical, but often to be irrational, or
at least to have a reputation for mild irrationality, gives you an
edge.