The desire for UHC isn't crazy. It's that plus green new deal plus whatever else.
It's also how you're going to make it happen.
Sanders universal healthcare assumes a lot and it's been priced at 35 trillion over 10 years. That's roughly double the federal budget.
That's just one policy and I don't see tax rises covering it. I would raise taxes, wait a year and see how much you bring in and then go from there.
You also need bi partisan support as eventually the GoP will win another election. You would have to make your policy work and enough GoP voters dependent on it they can't risk sabotaging it.
Yes we have universal healthcare here, we still have private, and we have proportional representation. Bernie would fail here as an effective polititian and couldn't deliver on his policies. That's in one of the most liberal countries in the world and least corrupt.
You have to be realistic in what can be achieved plus have a realistic plan to get the voters to support you.
Alienating your own side and being so hardline compromise is a dirty word with no way to get policy through Congress isn't good strategy.
If Biden wins you can pressure him. Can't do that with Trump.