Especially if you ban the books from the high school library, but not the local library from which students can check out with only slightly more effort.

I think, though, the forbidden fruit effect only works if the book in question is sufficiently well-known. There was an article a while back about a "concerned parent" trying to get a children's book about gay marriage removed from her local library - if she'd succeeded, I doubt there would have been children clamoring for the book in the area - they'd never know it existed, it would be hard to find for the parents, and possibly too expensive for some, etc.

That's another thing that gets me about banning books in libraries. It's a classist thing, because the well-off can always spend their free time looking for books and their money ordering them off Amazon or what-have-you - a single parent working two jobs doesn't have the time or the money to make that happen. Libraries should be equalizers, and intentionally removing books from them creates inequality. Like so many political posturings, it hurts all of us, but it hits the most vulnerable the hardest.