Obviously, you can't carry every book ever forever. I just meant that the general public should have timely access to books deemed too controversial by the elites, so that the plebs may make up their own mind.
And beyond that, I don't think you mean what you generally say here, that libraries should have books that are considered controversial by elites. I can think of plenty of books that are controversial to leftist elites and plenty of books that are controversial to right wing elites.