Stochastic terrorism is the phenomenon where the capitalist system defends itself by inspiring the disaffected to commit violence on the system's behalf, by using propaganda that blames threats to capitalism for the problems the disaffected are experiencing. School shooters are simply the most extreme expression of this: Online trolls are less harmful, but their purpose is ultimately the same. They exist to attack everything that threatens the capitalist order, in order to make life as hellish as they can for anyone who lives their life in such a way as to be a threat. (This is why their targets are largely folks like trans people and jews.) They are, to put it bluntly, volunteer fascist footsoldiers.