The librarian who quietly removes a book from the shelf because of a noisy complaint is more guilty of restricting intellectual freedom than the complainant. The librarian has responsibility to a tradition, a body of law, and to the procedures established and approved for dealing with complaints. Worse, once the librarian has surrendered on a single occasion, he or she is the first target in future assaults. Extremism feeds on success. It is made bolder and more demanding by victory.–Joanne Goldsmith
http://www.ala.org/ala/oif/iftoolkits/ifmanual/fifthedition/Default3866.htm