Y'all need some real alternatives to the status quo. I'd suggest exploring actually leftist ideals, but would have to be outside the current two-party system, because Democrats already proven they won't do it, as they pushed Bernie aside for a person no one seemed to like.
https://newrepublic.com/post/181327/mitt-romney-congress-ban...
When all you know are those two options, then yeah, they look like two very different options.
But once you explored the other ideologies and political ideas out there in the rest of the world, you'll see they both end up being pretty much "center-but-slightly-right", one is slightly more conservative than the other, but otherwise they're pretty much the same poison.
Loads of examples; Vox (Spain), AfD (Germany) and whatever National Front (France) is called nowadays, all take harder stances and are pretty honest about their want for centralization of authority (for example), for better or worse. Golden Dawn (Greece) is probably a even stronger ultra-nationalist example, but they basically have no support after getting banned.
Although I will say that is seems almost futile to compare left/right between countries, we all have somewhat different understandings of it...
> how do they avoid the civil unrest the US is seeing
What civil unrest? I'd say things seem surprisingly calm and the population almost pacified. We're starting to see some smaller embers of something starting, but compared to how things could be considering the circumstances, it seems pretty idle.