>Plenty would prefer their children not be able to learn about communism

Plenty of people would prefer that children not learn about scientology from pro-scientology cultists too. It's not that they can't know about scientology (they probably should, in fact, because knowledge can have an immunizing effect against cults)...

And it's not that they can't know about communism (they probably should, in fact, because knowledge can have an immunizing effect against cults)...