Seriously? The people who are building concentration camps? The people who oppose single-payer healthcare? The people who are running headlong into war with Iran? The people who deny that global warming is even happening?
You're going to side with them because you think politics is solely binary and that an impoverished police state is somehow similar to the governments of the wealthiest, freest states in the union?
Well, he seems serious to me -- and for what it's worth, I can understand why. The alternative is presently calling his religion a front for a cabal of pedophiles, his culture inherently evil and oppressive except where it's marketably quaint, and his politics so self-destructive they could only come about by evil people duping stupid people
en masse. Do you see how that might not appeal?
Furthermore, if someone is used to government not working, the people whose central idea is that government can fix everything for everyone can easily come off as naive. Arguing on moral grounds doesn't help dispel the impression that progressives aren't practical, either.
To the degree that that's fixable, it is, I think, down to the radical progressives to frame their proposals in ways that localize the effects until they can be considered in kitchen-table terms. For example, "single-payer healthcare" is a great slogan, but nobody has agreed on what it means at the budgetary level. Nor is it enough to just lean on class warfare and say all the money is coming out of billionaires' hides.
It's kind of like how there's a lot more of a pipeline for young Republicans to get involved in politics in college and so forth because they actually get paid. If you're asking people to choose between "you get to save the world eventually" and "you get to eat lunch today", expect hungry people to disagree with you.
I know there's that canned compass-vs-navigation metaphor that gets parroted to excuse progressives from having to plan anything, but ultimately, budgets are persuasive. It'd be nice if the far left had some.