No one escapes entirely unscathed, but there are tremendously different degrees of viciousness and ratios of victims to victimizers. Twenty ganging up hard on one, with the authorities turning a blind eye isn't something "everybody" faces.
So, where were his parents? You mention the school’s responsibilities- what did the school do? I had read anywhere that he was ganged up on by twenty bullies - so why weren’t the police involved?
From what I’ve seen so far, the psycho didn’t shoot bullies - he shot the principal and bystanders.
Broken brain, likely from a broken home.