When kids suffer abuse at home from parents and siblings, they often then go to school and suffer bullying from peers and an endless series of dictates from teachers. They begin to feel trapped as they can't avoid abuse no matter where they are. In addition, when they see that the authority at home is part of the problem, and authority at school is either unconcerned or useless at helping them, they gradually realize that authority is fundamentally two-faced as it is not based on kind guidance as officially stated, but instead is based on controlling and exploiting the less powerful.

No Killing In The Hallways, depicts some of the worse school shootings in history, including: 

Virginia Tech
Columbine
The University of Texas Sniper
The Ecole Polytechnique Massacre
Red Lake High School Shootings
The Beslan School Hostage Crisis plus more