I hear this all the time, people wanting to suppress ideas because the are 'dangerous'. I do not get it. Do they think that people buy into every new idea that crosses their path? Because if that were true, I would be in so much debt. I could not do anything without having to buy a new car, or drink beer, and I certainly could not work because I would have to go to Mexico and the Bahama's. Don't people realize that trying to suppress an idea can make it more dangerous? In that, young people will want to find out about it, and will think that it is an important idea because it is being suppressed?
Teenagers drink and smoke because they are not allowed to, because it is an 'adult' thing to do. (I am not suggesting to make it easier for teens to do those things, it is merely the easiest example.)
So, why ban books that are clearly fantasy because they promote witchcraft? People are smarter than that, kids are smarter than that. Give people the benefit of the doubt.