"Kids are our future," that is, until you have to actually spend time with them. Then they take on the guise of a cocker spaniel puppy that needs to be house-broken. Everyone else, including their own parents, want someone else--anybody else--to clean up the errant pee.
This extends to crimes, deviant drug behavior, truancy and now assaults.
I buy a car, it's a lemon, it goes back to the dealership. Your kid is a loose nut, take him back to the parents. Don't expect the teacher operating under bizarre ROEs to do what you yourself would not.
If your story encompasses aspects of teaching, or your background as a teacher influences your writing, use this as a plot point.