Here's the issue, as I see it, with banning people based on "bad faith" - the person doing the banning is assuming bad faith and that is a mistake, IMO.
Over the many years I've read/posted on political chat forums, there have been dozens of times that someone says something and I think "There's no way they actually believe that!" Most recently, it was related to the "stolen" election and covid. In reality, with the right external influences, someone can be convinced to believe nearly anything. There are people who, even today, have been convinced that the Earth is flat, the moon landing was staged, there was a pizza restaurant housing pedophiles/abducted children or whatever it was.....
When you consider the extremes - the nonsensical, conspiracy theory stuff - you realize that, with the right social media feed, podcasts, authors, etc, there's really no limit on what someone can legitimately believe politically.