I think the leftist indoctrination of school children has a lot to do with the emergence of the mass school shooters. That and the rise of the use of drugs, mainly in active boys, to alter behavior.
And if you want to know where the money in school doors that don’t close, went, you can look at the multiple cars in “teacher’s” driveways.
The kids aren’t learning and they’re not safe. The masking and anti-white racism should have been the giveaway.
Social media has a lot to do with it as well. I was a kid in the early to mid 1960's. The only information, points of view, etc we were exposed to came from parents, school and schoolmates, books, TV and movies. In the town I lived in, we only had 2 channels. One of the channels was shared by 2 networks.
Today, some loser like the Uvalde shooter can logon to any number of social media sites where other losers discuss topics like shooting up a school. TV has a gazillion channels showing nothing but crap. Minds are being filled with that crap.