[3pt14159]

Sorry to be a little pedantic, but libraries do not treat all information as equal. There are far, far fewer books written by nazis in the library and most of them are by former high ranking members of the 3rd Reich so students and historians can research the Second World War and The Holocaust.

Even access is limited in some libraries for some information like technical libraries and books describing the manufacturing or design of dangerous materials.

[dodgyb]

I am not sure librarians are the ones who decide that a particular subject is socially or technologically dangerous.

The point still stands, the information that libraries provide is organised to an open standard defined by information science, not an opaque algorithm that is subject to the whims of its creators.