That's probably what they were hoping for by gagging all of the motivation behind the spree killing, they do all blend together after a while tbf.

Nobody really gives a shit anyway imo, or they'd address the common denominator of mental health treatments being fucking terrible. You can get some kid to kill for basically any cause, if they're retarded/damaged enough. But it's easier to scapegoat responsibility away, so it's vidya games or devil music or sentient guns over and over.