Note that this is a decentralized effect though. There's no grand authority saying to remove ideas, librarians are making the call themselves. But it is saying

Note that this is a decentralized effect though. There's no grand authority saying to remove ideas, librarians are making the call themselves. But it is saying a librarian may not want to loan out to kids books claiming women are inferior or the like. It leaves librarians individually to decide if a book's historical value outweighs the negative values of its older views as well. It doesn't expect a librarian to be an expert in all fields, but on nonfiction topics, many five year old books can safely be discarded in exchange for newer ones in fields like science and technology in particular. If one is regularly replacing books about the planets, one doesn't need to know that Pluto is no longer defined as a planet, every book in the last five years on the subject will do that for you. Another important note is that CREW is for public libraries which can only maintain a collection of a certain size and which needs a high percentage of material to be frequently accessed. An academic or research library would have a very different strategy.