>>514137944
They keep happening because schools are the only places where you're 100% guaranteed that no one will be armed and able to shoot back.
From an evolutionary perspective, this is an extreme form of mate suppression by those denied the privilege of mating (if I don't get to have kids then neither do you).
Sociologically, it could also be interpreted as an outward manifestation of misanthropy (hatred of human life) in a literal sense - by denying it any future.
Biologically there's the "spiteful mutants" angle of course (high mutational load individuals who hate normies aka the genetic baseline and follow destructive urges).
It's probably a mix of these and other factors I haven't thought of.
But more than anything, society has just become such a lonely, torturous, treacherous, antisocial, sadistic shit show with no rewards for being a good stable moral person. Quite the opposite, you just become prey if you are. There's no way to win, in social life, in relationships, in career... yeah. That's my take.