What would you suggest is the "more nuanced approach"? Also, I am not some weird .1% fringe based on any polling, there's plenty of people who hate their own government and can see advantages to that of their "enemy" even if they don't want to defect.

Negative partisanship is the major driver in most politics because, again, the State fails to provide for the citizens, without fail, in every system, if it would infringe upon the ability of the State to amass/maintain power. It's easier to say "at least I'm not that guy" as you trample on the populous, so we agree that everyone loves a scapegoat. I can do plenty of nuance, but you started at generalizations and I was refuting that first as that's all I have to go on here.