Reaching deep into the few remaining lib braincells I have, I can say I see where some of the talk about people being disappeared or blood purity could be used to expose children to the idea, but keep a layer of fiction over it to make it easier to swallow. However, the communist brain screams there's a billion stories that do the same thing without inherently showing the racists to be right or even acceptable.

EDIT: holocaust literature should also be either explicitly about the real holocaust or, if employing metaphor or allegory, the allegory for the holocaust must be the centerpoint, not just a part of the story.