I had a cousin who passed away recently. Not sure if it's totally relevant, but she was a drug abuser. Mostly pills, but meth too and all of that mess. She suffered from a brain hemorrhage and died. They flew her by life flight to the hospital in Houston, where she was in intensive care for 3-5 days on life support (brain dead). Her husband, my cousin, has a very average job, no health insurance. I only mention the drug abuse part because they have always been broke, barely pay the bills, she only worked off/on here and there through the years. Not a bad person, just one of those deals she could never shake. Their personal lives have always pretty much been a mess, both financially and relationships.
Anyways, I'm willing to bet he pays $0 for all the care she received up until her death. I mean, the bills are probably well into the 6 figure range at least, possibly $300-500,000 dollars. I have no idea. So why pay anything when you could never even make a dent? I wouldn't. So the money comes from people like you and I, who do have good insurance, just so the hospital can keep the doors open. This is the main reason why I favor some kind of bare-minimum medical insurance safety net, because we're already paying for it one way or another.