Yes, they can believe whatever they want, but when they start trying to ban books (or burn them, as happened in Pittsburgh last year), it worries me.
Well, let's be fair. The ALA considers any questioning of the appropriateness of a book (like, for instance, not wanting your sixth grader to read Slaughterhouse 5) to be an attempt to "ban" the book. The ALA is truly more wacko than most Harry Potter critics.
Personally, I simply have not come to the conclusion that Harry Potter measures up to the quality of books my kids should read. We are Christian home-schoolers who believe that our kids' books should teach and reflect what is good and noble.
I don't let them read the Goosebumps trash. I have purchased a paperback copy of the first Potter book, and my wife and I will determine whether it measures up. It probably will not. That doesn't make me a nut, as some of you would insinuate. It makes me a discerning parent.
Don't you understand? You are supposed to install a pipe that runs directly from the sewer of popular culture into your living room and your children's rooms. Make sure that the river into your home is unfettered and runs uninhindered. Only in that way can you prove to the "enlightened" that you are not an enemy of the people.