Forgive me if this is a stupid question. I always thought that most Americans got their healthcare through their employers or private insurance which they have to pay for. The shortfall is for the poor who can either not afford insurance or don't have jobs that give them insurance as a benefit.
It's that section of society that the universal healthcare most benefits, right? It doesn't make a lot of sense to compare private US healthcare to public healthcare in Canada or the UK. In Australia everyone knows private care is better, but not everyone can afford that.
Most do -- first, the scope of what we're talking about is different than in countries with much lower populations. Before the ACA, there were something like 40 million Americans without insurance. Second, it's not as simple, I don't think, as how you're thinking of the insurance people had.
Stuff like employer-provided healthcare always varied widely. Plenty of people didn't get coverage from employers, or couldn't afford it (a large percentage of employer-provided insurance was not completely gratis, but shared cost, either with an actual cost, taken out of every paycheck [which could often be in the hundreds a month], or in stuff like health savings accounts, which employees paid into), and the cost of private insurance is like a joke, it's so astronomical. People could pay more than $1,500 a month, easy, for a small family, for shitty coverage.
Add to that that insurers, before Obamacare, were not required to insure anyone. Even if your employer provided insurance, for instance, but you had diabetes when you were hired, the insurance company would cover exactly nothing connected with it, as it was a preexisting condition. Also, there were lifetime caps on coverage. Christopher Reeve (Superman from the movies in the '80s, among other acting work), hit his cap after he was paralyzed in a riding accident. His friend, Robin Williams, took over the cost; otherwise, it'd have bankrupted Reeve's family in short order.
So, yes, it's the uninsured (who aren't just poor people -- note the costs we're talking about), but it was also a ton of people who weren't covered, or coverable, or just had marginal stuff, or... that Obamacare was attempting to patch together. So universal healthcare would save not just the uninsured, but -- especially if key provisions in the ACA are overturned -- tens of millions of others, or hundreds, if people with employer-provided didn't have to pay, etc.
Medical bills are the
biggest cause of bankruptcy in the U.S., and many of them had insurance.