Why do some men behave badly?

I’ve confronted this topic a lot
one bit of research referred to is at the '***hole gene' - it argued that there has been historical advantage for 'iconoclastic' decision making
it's probably helped win battles and defend castles as well as help make scientific discovers and new artistic expressions
One thing my girlfriend says is that "sometimes you need an ***hole on your team"

The example she uses is as an agent.

You're an artist or an athlete, you just want to sing or play or whatever and want everyone to like you"

You need someone who will tell your team/label "take this insulting offer and shove it up your ***! And don't you dare call me again until this number is at least tripled!!!"