alanabit, your last sentence was very interesting to me. 'What is it that turned her assailants into something full enough of rage to do this?' From various sources, I've learned that in history, conquering armies all over the world in many ages who are looting and pillaging see it as normal to rape as well. It has happened even in Biblical accounts. So I would postulate that it may not be due to bad parenting or modern influences such as violent video games etc. I'm no psychologist, but I wonder if the 'fight' or 'attack' hormones in males (maybe not just humans) also give rise to anger, sexual arousal and dominant mating behaviour.
Many male mammals will mate with all the females in a group after winning a fight against a dominant male. These men (please do NOT think I am excusing them, far from it, just seeking some form of explanation) were aroused by hatred, anger, need to self-assert, bitterness etc and this in turn seems to bring about the 'red mist' and sexual attack. Men can be dangerous. In Rwanda they even chopped off the arms of young children.