As stated in the "Background" page, libraries are still pressured to remove certain books because one person or a group of people find the book to be inappropriate, offensive, or contain material that is objectionable in some way. The bottom line is, people don't agree with the whole book or parts of the book and want the book to be banned from others being able to read it. The good news is, Intellectual Freedom is where libraries fight to keep these books on the shelves so you have a variety of materials to choose if you wish.