It seems to me that "I condemn Nazis and the KKK" is pretty much a "motherhood"[1] statement and you'd have to be pretty extreme not to make it. Even Jeff Sessions condemned it, and many of those on the left consider him a complete bogeyman.
So while increased polarization might be a problem in US politics, I'm not at all sure we can see that here.
Edit: And who on earth downvotes a comment like this? I don't need to complain about downvotes, but what on earth are people thinking here? Is it people who support Nazis who downvote this, or is there some subtle point here I'm missing?
[1] Motherhood statements are those statements that politicians make that "everyone" agrees with; eg "I think motherhood is great"