Censorship and Self-Censorship in Children's Books

Today, what kind of censorship is exercised in libraries catering for children? Censorship campaigns, managed by political parties and family associations, are increasingly vocal, and are relayed by the media. They seek to identify books judged to be "noxious" or too "marked". Librarians, for their part, avow their dismay before certain "disturbing" books. But isn't it the role of literature to disturb? Isn't the important thing to offer multiple points of view?
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