If the posts in other communities show an intent to cause disruption for a specific topic, they do make sense.
I’d rather have the ability to flag these potentially disruptive users and have their posts being held up in a moderation queue for those communities.
That way if they behave, they can participate, if not they at least the posts / comments were filtered away and didn’t reach the entire userbase, minimizing harm while giving them the benefit of the doubt.
Self-satisfaction?