if you de-sensitize a child to a behavior, it then becomes easier to persuade that child to particiapte therein. and if the child has a trust relationship with an adult with whom the child has been taught to discuss such matters, guess who has the edge here?
and we wonder why there is so much child/teracher sex going on?
True, to an extent, but within reason. I'd wager that letting a child know that there are people sick enough to mutilate their own genitals would not necessarily inspire that child to mutilate their own genitals in turn.
If public schools insist on introducing this sort of information to children, it's up to parents to provide a strong counter-balance.