In the right hands literature containing racism can be good. It could be a great teaching tool against racism. Unfortunately there is the other half of things where it is so public and that anyone can get a hold of it at any time. And the majority of the time these people get to read it unsupervised and aren't given the chance to discuss what they read and the impact it might have. This happens with a lot of things, not just books with racist themes. It falls to the parents and teachers to make sure that when and if this literature falls into the hands of young minds that it teaches them right from wrong.
I don't think it should be banned. First of all there is the right to free speech. But I think it helps people see what racism is like and the damage it can do. I think it could do more good then bad. And besides, when things like this are banned, it is just one more way to control the general populace and not in a good way.
Hope this makes some sort of sense and I'm not just ranting unintelligibly.