Most children - I know I did when I was a kid - fantasize another set of parents. Or fantasize no parents. They don't tell their real parents about that - you don't want to tell Mom and Dad.
Ideas are only lethal if you suppress and don't discuss them. Ignorance is not bliss it's stupid. Banning books shows you don't trust your kids to think and you don't trust yourself to be able to talk to them.
