Careful:
http://www.independent.co.uk/news/uk/home-news/women-are-more-violent-says-study-622388.html
I believe men and women are more or less equal when it comes to violent tendencies.
http://time.com/2921491/hope-solo-women-violence/
And you only need to read the newspapers to realize this.
Here in Belgium, we have a notorious story where a woman killed her 5 children, Magda Goeubbels style. And you know how some of our media spinned it? "It must have been the husband's fault, he was never around and he was a bit weird!" Please.
There's a great movie about this event if you want to check it out: A perdre la raison.
http://www.imdb.com/title/tt1660302/?ref_=fn_al_tt_1
Edit: I haven't seen the movie, but apparently, from reading the first review titled "A subtle portrait of abuse", the movie's portraying this female murderer as a poor victim. Ah well...
You and many people believe this assertion because there is this myth that women are little angels who can do no wrong and they need to be protected from violent testosterone-filled men.
Reality says otherwise.