I don’t like the idea banning posters or deleting comment. I am loathe to do either. As such, I am going to try a new moderation option. From here on in, users who cannot follow basic guidelines will be forbidden from writing in any topic save ones I explicitly mark as bins for them.
If they wish to participate in other threads, they are allowed only to make comments with a single link to a comment they’ve made in such a moderation bin. This will allow them to still comment while not forcing readers to see what they say.