If it's not for children, why is it in school libraries? The problem is not that it exists. The problem is that it is being put in school libraries. If you read it you will likely see why. It literally has graphical depictions of children engaging in what would be considered hardcore pornography in any other context.
I can self-describe liquor as a "natural sleep aid for young adults", that doesn't change the fact that it is liquor and has no place in a high school vending machine.