It is mostly about infringing the restricting the ability of individuals to choose what they would like to read, hear, and watch; and also infringing their right to free expression.
:-) On the topic of the book by he-who-must-not-be-named, I beg to differ. The intention is quite clear, copyright is just the means to achieve it.
Here is a Gedankenexperiment: assume that there is a jurisdiction in which the state, instead of the estate [1], automatically becomes the copyright holder after the author of a work passes away. [2] If the state starts making rules on which books by dead authors cannot be published, wouldn't you call it censorship?
[1]: Sorry for the a-maize-ingly corny and unfunny dad joke, couldn't resist.
[2]: This is not too far fetched, apparently this is roughly what has happened with you-know-what in Bavaria.