I'm surprised at the books mentioned in the article. While potentially inappropriate for elementary aged children are probably more than okay for teens and high school aged. The restrictions themselves without context, review requirements or any rigorous standards is likely excessive.

That said, there are definitely examples of books that have been put into school libraries that can be considered obscene, that you can't post screenshots of on Facebook or other social media platforms, or quote or otherwise read into a school board or city council meeting. Such as graphically depicting a minor student giving fellatio to a teacher. That are wholly inappropriate in any school setting.

And that isn't to restrict a parent who decides to allow their child access to this kind of material, if deemed mature enough to handle it. Only in that it doesn't belong in a public or school library. They simply aren't meant for children. Aside, I'm even open to an "adult" section of libraries that do offer mature content access/storage for adults, such as Playboy, which has a history of decent journalism.