Yeah I never understood that ( I’m from Scandinavia or as your conservatives describe it - that socialist hellhole ). I recall seeing a study some years ago that the US spends many billions a year more on healthcare than it would with universal healthcare.
So what if my taxes pay for the treatment of someone’s cancer? It goes the opposite way too, healthcare that I need is being paid for as well and nearly everyone needs some sort of hospital or emergency care at least once in their life - regular doc appointments likely once or twice a year. Over here, I make an appointment and walk out without paying or even seeing the bill.