I think a forum where bad faith polarizers are downvoted and good faith open minded discussion is rewarded would go a long ways.
Trying to maintain a civilized discussion about modern politics is like walking a tightrope. You can say "anyone who knows what a tightrope is sees that falling off it would be bad", and it's true, but, does saying that mean that you'll avoid the fall? The failure mode is extremely obvious but not at all easy to avoid.
If you don't have an intuition of "politics are inherently corrosive to human minds", I suggest you get one. It's not impossible to have a civilized discussion of politics, but it is unlikely and unnatural and unstable. It's very, very, very hard to set up and maintain an environment like this in practice.
I won't admit that, because it's not true. You saying that it's true doesn't make it so.
You're asking for them to admit something that isn't true. There's nothing political about recognizing that political discussions are a complete shitshow and wanting them to not crowd out everything else.