Teacher burn-out is mostly ignored because fixing it would require undoing some very deliberate changes, like keeping bad kids in school and even in normal classrooms. We'd have to empower teachers to expel kids who refuse to be students.

Wife has been bitten, stabbed, attacked by students many times. Nothing is ever done. Usually a small number of kids that ruin everything for the rest.

  Many schools are a blame teachers culture.   

She’s been at this long enough many of the trouble makers have grown and are in jail, missing, or dead.

Turns out ignoring bad behavior doesn’t work.

To be fair, the teachers sort of deserve some blame, in multiple ways.

They somewhat willingly support a union. (they at least voted to unionize) That union, via stealing from the teacher's paychecks and "donating" to politicians, is a corrupt money pipeline from taxpayers to one political party. That party opposes anything that would enable tossing out the bad students or punishing them. The resulting awful work environment is thus, indirectly, supported by the teachers.

There are in fact many poor-quality teachers. Firing them is difficult, again because of the union that they endorse. I'm seeing hypocrisy lately, with union-protected bad teachers protesting against unions protecting bad cops.

The awful work environment discourages people from entering the profession. Because of this, schools have fewer good candidates to hire. There isn't much point firing a bad teacher if a replacement is unlikely to be any better.

In our state, that can be a felony aggravated assault charge (assuming they meet mens rea and charges are pressed).

2nd graders pretty much have to kill or permanently maim the teacher before something serious happens.

Of course some of these are 3rd time 2nd graders

Yeah, that's a bit on the young side for mens rea in most states. And even if they meet that the system is hesitant to do anything.