Strange, I find that leftists dominate this forum, many of them making provocative posts just to get a negative reaction, which is trolling. Some are even blatantly rude, almost snarling at times when they post. I don't think there's any alt-right types.
Just because someone says things you find distressing, because they conflict with your own view doesn't make them a troll. I think the poster bush_cheney is one of the best posters here. I find his posts well thought out and he is generally polite. Sometimes he does not come right out with what he means... you have to think a little to figure it out. That might be confusing for those who are not used to that style of posting.