I just heard a discussion on the radio of the need to train police officers assigned to schools in deescalation techniques to help them avoid unnecessary violence in the schools. Sounds like a partial solution to me, but a necessary step. One way to deescalate is for the officer to recognize things that are not police matters, and refrain from stepping in. (If all you have is a hammer, pretty much every problem looks like a nail. If you are a police officer, are you not likely to see situations as requiring policing, even if they really do not?)
Are there not at least three people involved in each such incident -- the police officer, the student, and the teacher. Should teachers not also share in the blame for such incidents, and should they not receive training as to when to handle situations themselves, deescalating student behavior, and if necessary calling on the appropriate school official for backup rather than an inappropriate police officer?
What about parents? Should they not teach kids not to act up in school, not to anger teachers, and especially not to anger police officers? Parents in fact regularly teach kids to avoid problems and to deescalate situations before they become dangerous. Schools can also provide this training for kids, which may help them more in life than some of the lessons actually taught in school.