Quote from Yannis:
There was recently a case in California where a librarian lost her job because, after seeing someone looking at child pornography on the internet, called the police (the practice of frequenting those abusive sites is illegal.) Huge controversy, ginormous. Setting and policing library policy is not trivial, there's a lot of room for disagreement and misunderstandings here.
Since it is illegal to go to those sites, why was the librarian fired?

And point taken. You do have a right to know about the book.