My wife worked in education for 20+ years. Her #1 rule was never find yourself alone with a teenage male. But, it sounds like your wife has a case to file a lawsuit against the district for wrongful termination. (Yes, school districts can be successfully sued. Been there, done that.) Too bad you don't have some muscled-up high school football players in your family.
We were ready to sue the school but the attorney told us it was a waste of money that would likely leave us looking in worse shape than we were in. Probably should have gone on with it. It’s not too late I suppose…not sure the statute of limitations on such stuff.
Oh, and I see no reason to speak of violence toward anyone on a public forum. Private conversation anyone?