Not a "Political Correctness" issue so much as a "Jim don't want to hear you guys arguing about this when you're sitting on his couch drinking his beer." The new policy applies to both Left and Right, and everything in the middle. As for the Be Nice Or Go policy, that's not about sensitivey cuddlesomeness, it's just abiding by our host's standards of behaviour. Manners, basically.
You weren't here for the Epic Pissing Matches that spawned in TT. We've got people on the Left, Right, Middle, as well as some people who are Extreme Left on a couple issues, but also Extreme Right on others. Even I, paragon of genteel and respectful conversation, from time to time, once in a great while, would upon rare occassion. say things that might be considered sarcastic, unpleasant, even snarky. We had some good discussions, good points, thought provocationey things. And for every one of those conversations, there'd by 6 where things just kept going south of nasty. Then the "debates" would spill over into unrelated threads about the books, kitty cats or cheese. This happened more and more.
Back to the biggest thing though, is that and Jim just wasn't comfortable with his house becoming politically factionized. What often happens in politically mixed interweb communities is that one faction or the other achieves an impression of dominance by shouting loudest, and then drives all the others away. Jim don't much like the thought of Fans from Group A (Whoever they are) chasing off his fans from Group B (Whoever they are). So he likes it better when we leave political and social issues outside. That, and it just made a big, whomping pile of A + Ass Ache for the Admin and his lonesome few mods.
We still have the Advice Corner, where people can to get help and support, (as opposed to just bitch).