I have a theory that everyone has a different level of detachment vs self-insertion when consuming a fictional narrative. Those more self-insertive probably shouldn't read his books.
If anyone has any ideas on what the point of violence in art is, I'm open to hearing it. Obviously horror is a genre and so is gore, and people seem to enjoy being shocked. I don't think that is what McCarthy was going for though. And he wasn't going for the vengeance-catharsis angle like Tarantino either.