I know of a few incidents at schools in Florida involving firearms this year. These are not shootings, but situations where kids are found to have a gun in their possession on campus. In each case, the response from the student is “for self defense”.
I have no doubt that many kids spend the day in school in fear. Schools do nothing about the bullying. They didn’t do much back in the 60s when I was in High School. They do even less now.
Gym teachers encouraged it. I still remember most of the football players with disgust. There were a couple of bullies who would kick people who got in their way in the nuts during the basketball unit. The Instructor looked the other way. When I heard he died years later I went out and had a beer in celebration.