In the old days, there would be more kids with guns on campus (unloaded, except when allowed).
High School Gun Clubs wiki
https://en.wikipedia.org/wiki/High_school_gun_clubs_and_teams_in_the_United_States
Also- I think gun control can do some good in terms of making people go through more to get and keep them safely. But that does not apply to the mental state of these teen boys who now see this as an option for their woes.
I think in the "old days" this option of lethal actions would not have even "occurred" to a kid.
In the last few decades, these shooters may be seen as heroes for other teens who feel bullied or unfairly treated. (If you look at what precedes it, it is often getting in trouble, e.g. suspended, expelled, humiliated in front of peers, etc...)
The rise in shooting is not in some vacuum of
just these kids and parents....it points to additional mental problems of many more who don't go through with it. There are new inputs in the environs of these kids that is giving these outputs, and it isn't really about the guns themselves but more about an increase to see them as a solution. Find the largest driver of these issue and address that proactively.
(what that is, I can't say with any confidence!!)