You include /r/politics on that list, which as we speak, has 100% of the front page dedicated to how horrible our president is. That is the absolute opposite of “thoughtful”, certainly not polite once you get into the comments and say anything that doesn't agree with that stance.
I’d give you echo chamber, but also point out that applies to most subreddits in your list, but especially to the ask_$ideology types. People celebrating their political wins isn’t trolling, neither is celebrating the losses of the other side. It might be many things, but posting to get a rise isn’t it.
It doesn't even make sense - people posting in their own communities about their own ideologies doesn't meet the definition either. Who would they be trolling, themselves? Oncomers who don't agree? If the latter, that applies to every political community everywhere.