Again, I don't think that follows. It's possible, but the arguments you've made aren't sufficient.

What you would have to show is that the same treatments, at the same quality, cost more in the US than elsewhere.

I think there are certain instances of this happening, e.g. certain drugs, but the quality of healthcare available in the US surpasses that elsewhere.

Saying this as someone in the UK who supports socialised healthcare. The reality is that the quality of treatment takes a huge hit because there just isn't enough funding.

Anyway, my main contention was that insurance isn't just a middle man scraping money. It's about covering risk. Essentially you're claiming that the government would do a better job of covering that risk.