I will never in my life understand how Americans (myself included) can think this is, in any way possible, okay.
Or, how, if we just moved it more toward private companies having more control over our healthcare than they already do, that it'll get better. It's asinine.
Since you mentioned it, though: for people that are well-off in this country, the healthcare system works fine (more or less). That's probably a large source of the complacency. For both my wife and I, our health insurance plans are very good. They are paid 100% for us. They include a 10% co-insurance but a relatively low out of pocket cap.
The other big anger-relieving valve is Medicare, which removes a large proportion of major illnesses (anything with onset age 65+) from the problem space that private-sector health insurance has to address. If the elderly had to buy health insurance on the private market, or alternatively have their insurance covered via employer pension plans, I don't think the system would work at all, and there would be a lot more angry people (who vote at high rates).