It just so happens that more health care doesn't necessarily translate to measurably better outcomes (e.g. cancer screening helps reduce mortality for some cancers but not others).

It also just so happens that it's very rare to study whether a particular care regimen actually improves overall outcomes as opposed to just the thing it's ostensibly aimed at treating. Continuing our cancer example, cancer screening helps reduce mortality from _cancer_ for almost all if not all cancers, but for some the increased mortality from operations and other cancer therapies cancels out the improvement.

That's not to mention the fact that people in the US prefer to get care even if they know it'll likely make them worse than not getting care. I'll dig up the reference for this; I don't have it offhand.

I say it because many many many other places subsidize healthcare at least as much as America does. And people don't seem to count the taxes they pay as part of the monthly cost.

edit: edited my top comment, sources are there. Canadians, famous for cheap healthcare, pay $324 per month per person for healthcare. The government covers $227 of that, which means $227 per person per month comes from taxes.