This 1000%. The whole “your presence and existence at all is bullying me because I find it offensive that you exist” was definitely a thing then. Meanwhile a lot of actual harassment and really quiet a lot of sexual harassment and violence as well was tolerated and accepted as normal… and it definitely had a vector.
The thing I think is a lot of violently angry people also feel victimized and see themselves in these killers. Like on some level they’re supportive of spree killing because it is cathartic for them to read about it. And… well… that’s sad.
