The problem with topics bans is that you can sabotage topics you don't like to silence them. E.g. Rust evangelicals could have been silenced quite easely by flame baiting their posts.
Some people really don't need a whole lot of baiting; for example there's a top-level comment that reads (entire comment): "'peaceful support of Palestine'", without condemning Hamas is still pro-Hamas action in this case."
Never mind the stuff that's just outright beyond the pale.