Women reward it with sex. In my adolescent years I didn't really think about why all the men who randomly started fights for the sake of fighting all went home with, or caught the attention of other girls. The thing that bothers me the most is that these women form part of the jury in court. It's fairly obvious how women automatically assume a good looking guy to be a 'better' person who can do no wrong (the Halo Effect). How can they be trusted in that sort of environment?