So many of these stories come back to the issue of adults not being adults and enforcing discipline. Kids need discipline. If they go wild, then need consequences. If that doesn’t happen at home, it needs to happen at school. If the teacher can’t discipline the kid with threats of detention or other traditional school punishments - perhaps because the kids are threatening violence - then the police need to be brought in and the kids need to be treated like criminals. Its the same with the articles we read about kids brawling in fast food restaurants. Arrest the kids and put them in juvenile hall. But unfortunately, we are in an age when all adults seem able to do is wring their hands and talk about what they can’t do rather than doing something to stop the problem.
Teachers aren't even allowed to defend themselves against assault with a deadly weapon.
Teachers are an important part of the legal environment precluding parents managing their kids.
This has been a long time coming over nearly a century but it took a huge turn to the worse due to the "positive reinforcement" work of B. F. Skinner.