I mean, if there really was a book that was too harmful to allow at all and it was successfully banned, we likely wouldn't know about it at this point. I am ex

I mean, if there really was a book that was too harmful to allow at all and it was successfully banned, we likely wouldn't know about it at this point. I am extremely against book banning, but the possibility of some time in history where they really needed to disallow access to a book seems at least _possible_.