The problem is that the rules here can be arbitrary. I have refrained from commenting because so many have already put into words, better than me, how I feel about the matter. Is one comment calling someone a name breaking the rules? What about calling someone a name while making an argument? What about using "debate" to work users into a frenzy? I think we each have a responsibility to discriminate which comments are genuine and which are from shills or trolls; whether for fun or profit. As u/Basghetti touched on: if you can prove they are actively trying to wreck the site and shutter discussion here, then that would be an open-and-shut case for banning, in my opinion.

How I deal with users I think are bad actors or have a mental issue? I don't block them. I glance over their comments and don't give them much credence. The replies to those comments can be more insightful on how others react. Truth be told, it frustrates me sometimes how worked up you can get in those conversations. I think you waste energy you can use elsewhere. There are some pertinent quotes about arguing on this link: https://celebrateyoga.org/41-quotes-arguing-idiots/