"Regardless, teaching one side of a current controversy as fact in mandatory school is manipulation."

If there were a real controversy, sure, but the sides here are "everyone is a human worthy of rights, protections, and opportunity," versus "some people deserve more and opportunity than others". One is tolerant, one is not. I am under no compulsion to be tolerant of intolerance. It is proper, ethical, and moral to fight for the rights of all humans, and it is improper, unethical, and immoral to fight against them.

Not all arguments have two worthwhile sides.