Come on....do you really think there are no legitimate sides to contentious political issues like gun control? How about abortion? That "other side" you speak of, presumably actual US citizens, is not interested in "basic democratic stability", they just want their political argument to win out and become (or remain) law. That's where the division comes from, not conjured out of thin air by the Russians.
But the fact remains that whether you are an outside instigator looking to sow discord, a citizen participating in a political flamewar, a politician looking to whip up their base, or the mass media looking for clicks, the tactics are exactly the same. You could wrap a bubble around the United States and cutoff all outside communication and you would not see much difference.
If anything pours gasoline on this fire it is the detachment of social interactions on the internet. And that Twitter is such a hotbed of political "discussion" is a sad testament to the times, considering its very design precludes the possibility of respectful, informed discourse.
