We are men,unless we super green or not street wise at all,we know even minor transgressions against other men could mean death,I don't think the father would have done no dumb shyt like that,the fact of the matter is women operate under notion that most things aren't as serious as they actually are,and that statement isn't to absolve the young a$$holes who did what they did,they deserve whatever they get,but moving without thought of consequence is something I only expect of my children and the women around me.
The mother was visiting family in Oakland. She's from LA so maybe the father didn't make the trip. Either way you can't just expect a man to be around and save a woman from a dumbass decision. She's an adult and neither her nor her mother had enough sense to not run down and assault some teenagers. That's on them.