Just chiming in here to add a little information about book buying at libraries. My husband manages our biggest county library here in the Phoenix area and he rarely has a say as to which books to order. There are departments of people, normally called "collection development," who take care of the ordering. It was the same at the ASU library and at the city library I worked at. The exception is when there is a special allocation of funds, such as from the Friends of the Library, to purchase books.
Also, I did merchandising and displays at independent bookstores for over 10 years. When doing Banned displays, I did not choose books because they had rape scenes or other questionable plots to get people's undies in a twist. I picked books that I thought most people would think, 'why in the world is that banned?" That's the response we got from most people.