My sincere condolences to the family and friends of the victim and of the youths that just changed the lives of so many people. I don't think we can begin to imagine this kind of horror.
Someone knew they were trouble, someone knew they were capable of such things and we will likely hear that someone tried to report these guys to the authorities and nothing happened.
We don't have an appropriate penalty in place for those boys. But we can try to protect someone else by not turning a blind eye.