The proof of the success of government healthcare around the world - is their extraordinary popularity with voters. People, even when they complain about them, love them - and will fight to defend them. That they still complain is part of WHY it works well - because these things are accountable to voters - you keep it working well, by complaining. But if you thought it was a bad idea, you would not defend it.

And then there is the undisputed mathematical facts. In the entire developed world - no country spends more on healthcare than the USA (the country with the most privatized healthcare in the developed world), and no country gets LESS value for it's money. By every metric American healthcare is the absolute worst quality you can get anywhere in the developed world.

And yet it is, by a huge margin, the most expensive in the world.  There is no LESS efficient healthcare system ever invented than private enterprise.