A) Violating their contracts by firing some teachers that happen to be fucking up our children. .
Don't be an idiot. Follow the contract which has provisions (Yes, they ALL do) to get rid of the bad teachers. If the school administrators will not do their jobs FIRE them and hire some that will. Same for the school board.
Too many bad administrators and school board members hiding behind the teacher's union contract - not bad teachers being protected by it
You don't need to set-up the bad teachers for a lawsuit that they'd win by shredding their contract.
The union and its members do NOT want poor performers in their ranks, why the hell would they? But they will, and must fight tooth and nail to protect their contract.