There are two problems with this approach. Scholastic recently tried this with their book fairs before deciding that it was a bad idea.How about instead of banning the books, put them in their own section in the library. As part of the paperwork at the beginning of school, parents can sign off on their kids being allowed in that area? I'm not crazy about the idea, but seems a reasonable compromise. Kids still have access (or not) to the books, depending on what THEIR parents decide. Isn't that the point?
First, some parents will argue that you're "othering" these books and the content within them and making them seem "weird" or "bad" or "not normal". When it comes to books about homosexuality and race, that's not a great idea.
Second, some parents will argue that by moving these books into a special, restricted section, you're just making kids want to read them even more. Like the "adults only" section at the video rental store when we were kids.