Why was that thread closed
There is a distinct... flavor, that a thread will get, when it's too far gone. Sometimes, me wandering in and flicking the light switch on and off resets things and everyone calms down. This wasn't one of those times, and "topicban the person being a ***" only works if it's like, one or two people, and not the bulk of the discussion.
Discussion of Horizon, as I said, is not verboten. People just have to not be imbeciles about it, and sometimes a timeout resets things back to a reasonable state.
Also: don't *** in RT about a thread being closed. It's bad form, and you know better.