Humans tend to be an innately violent species. Violence always seems like a swell idea — until you get punched in the mouth. After that, violence starts to lose its appeal. But women almost never get punched in the mouth. So they have a greater tendency to think that violence is always the solution.
That could be some of it, but remember that women get sexually assaulted at far greater percentage than men do, and that can be pretty violent. I think what we have is suppressed rage at being smaller and weaker than half the population. It's almost like Napoleon syndrome.