Of course it's not, and we shouldn't even be considering any cockamamie rationalization they're offering. It's mass delusional fantasy, and it has no place in basic education.

If a parent wants their kid to learn the ways of the Cannibal Zombie Death Cult, that's what Sunday school is for, and if they want to be the best weirdos on the block, they can psychologically abuse their children at home. They can even shell out of their pocket and send their kid to a special school for ignorant weirdos. But the one place their future psychopath won't be getting indoctrinated is in public school.