I’ve never asked for a book to be banned, and don’t intend to start. I do, however, think that profanity, obscenity, and vulgarity have a very specific message - one of disrespect. Profanity communicates disrespect for God, and the others a disrespect for humans, their bodies, and sexuality.
Freedom of speech allows people to portray that disrespect as an attribute of others (either positively or negatively) or to directly project that disrespect as the author’s viewpoint.
I can deal with profanity, obscenity, and vulgarity when necessary, but often when I read or listen to audio books (as I spend a lot of time in the car), I would like to focus on other messages. “Offensive” language and explicit sexuality is very powerful, and certainly tends to distract from other more subtle aspects of literature. I have had a very difficult time finding lists of books of high literary quality that do not have language commonly considered offensive. I am not looking for an enforced rating system, just a resource for easily identifying books (especially young adult and adult fiction) that do not burden the reader with these distractions.