And yet, the average American pays more in taxes for public healthcare (medicare, medicaid) that they don't receive any of, than the average European pays in taxes for (some kind of) universal healthcare.

It's so bizarre seeing Americans in the debate not wanting "crazy high taxes like in Europe", because the US already spends twice as much public money per capita as the OECD average.

The dirty secret of course is that healthcare as a good is much more expensive to produce in the US than elsewhere, and a large chunk of that is because the private insurance system adds a ton of unnecessary overhead. And yet all the healthcare insurance companies in the US talk about making healthcare "affordable for all". Yeah, no, they're leeches. They're rent-seekers. They drive up the cost of everything.

The US has a massively progressive tax system. On a net tax basis about 50% of the country pays nothing. Sure, they pay sales tax and employment taxes, but they also receive some mix of earned income tax credits, child tax credits, snap, medicaid, housing, etc. There is no real way for the US to have a single payer tax system without more people actually becoming net tax payers.