That's so ****ed up, I'm really sorry to hear that. The problem is troubled kids don't realize they have support system to go to, and unfortunately some of them don't have any safety net at all.
Crazy shit happens in schools, it's really ridiculous. When I was in grade 10, I watched some guy run over someone on our school soccer field, dragging them across the pitch. An entire swarm of students circled the van, punched in the driver's window and pulled the guy out of the car where they beat the shit out of him.