Banning books doesn't work anyhow. All you do is increase sales - look at the recent nonsense over The Hate U Give in the US, people clubbed together to fund whole class sets. In the digital era it's nigh on impossible to do anyway. There will be copies leaked whatever you do. There will be no more burning of the Library of Alexandria.
As a librarian I am viscerally against the banning of books. What I am into is appropriate curation - it's a no-brainer to put, say, Judy Blume into a children's library, but you wouldn't put Forever in the 7-11 section, would you? Likewise, stocking Mein Kampf in an ordinary small-town library isn't appropriate, but putting it in a university library is important for anyone wanting to study totalitarianism. Those are content choices that librarians and booksellers make every day.
As for banning books because you don't like something the author said, no. It's far, far too subjective (have you read 1984? It's a warning, not a manual). Sunlight is the best disinfectant. If ideas are objectionable, let them stand, be examined, and allowed to fail in full view. It is always better to discuss than ban because there's so much to learn from discussion.