Bad position
Parents and educators have been building up to this sort of thing for YEARS. Now that they've put all these restrictions in place, and now that you can't punish kids like this in an effective way, they've painted themselves into a corner.
We had our kids in a private school then, for various boring reasons, moved and have them in public school. The difference is tremendous, and we moved away from a "gauche blue collar" area to a well-to-do suburb. The boys keep asking why the bothersome kids, who are always causing trouble and bullying, can get away with it. One of our sons got in trouble for hitting BACK. (I think the fact that he used martial arts knowledge worked against him within the system.)
When you get called out of work to defend your son because he was blindsided by the class bully and had the gall to defend himself, ... It's a sorry world.