well, as someone who 'engaged' with the Trumpsters a lot, I thought I could tell the difference between threads that could stay on the normal political thread vs. the ones that should go off into a dark alley. I also didn't see any mention of a ban, though I guess our few right-leaning posters felt that they were being given one.
Too many of the discussions weren't discussions. I and others would challenge one of their statements, or respond to a challenge of our own, and find that the replies started veering off into some form of planting a flag. There was a serious lack of any explanation of Trump's actions - for example, none of his supporters ever tried to make a case where his trade policy would end up benefiting American workers (boy, does that seem a long time ago), or why his responses to the Covid-19 situation do indeed show a man who can effectively marshall the country's resources.
Too often it would turn in a meta-discussion, about the quality of discussion or responsiveness of answers. That's not 'national politics'. Barry had a reasonable solution. It would be interesting to have more representatives of the right, but as the Washington Post has found out, too often you end up with Marc Theissen or Hugh Hewitt - people whose description of reality, or cause and effect, only work if you accept unreasonable premises and don't acknowledge the existence of alternate perspectives.