The post you are responding to is about punishing the victim because teachers are too lazy/cowards to punish the culprits. Cams incentivize them to do the right thing.
I hate camera proliferation but, judging by the YouTube plenty of bodycam footage, it does work.
You won't likely find the numbers you want because the very nature of the problem is that cameras make visible something that wasn't.
If the rot is so deep that even who was right and who was wrong does not matter, then that is a separate issue that members of the public need to sort out with each other.