Bullying has always been part of human nature. Mass shootings are a modern phenomenon. They also didn't become widespread until well after it was possible to obtain the weapons necessary to carry one out. Bullies are a factor but it's a far more complex subject than that issue alone can explain.
I was bullied as a kid, and if it had been that easy for me to get guns back then I would have seriously looked into it.
Yeah, it is that simple.
The relatively recent accessibility of guns everywhere in some parts of the country makes gun tragedies a lot more likely.
Whether it's bullying at school, domestic partner violence, or cops having to shoot first because a perp on the street is much more likely to have a gun than other countries.
Kids shooting people in school has been around just as long. Usually they shot teachers. Note that parents were concerned about the safety of kids bringing pistols to school even back during the pioneer days:
I doubt it. Don't get me wrong, I am not defending those fascists, but a 14 year old (freshman?) is not going to just up and kill a bunch of people over politics they almost definitely do not care about one bit.
I recall plenty of kids that enjoyed hurting others... We need common sense counseling and mental health care checks for students, and for adults in this country.