Good points everyone. To add, I have a Kabbala that one of the “causes” of the OTD problem is parents not paying full tuition (for whatever that means, and however He makes cheshbonos up there).
SJS:
So send to a school where the Rabbaim and teachers do care about the children. They do exist, and if you have to pay more, aren’t your children worth it?
To th OP (WIY): To remove a child from a school is equal to telling them they no longer have to keep Torah U’Mitzvos, and it is on the Cheshbon of the one who removes the child. It may be required (just like you must kill a Rodef), but does anyone want that on their cheshbon?