Why do americans idolize Canada and Swedish healthcare?

I know Canada and Sweden healthcare system is nice. However, do we really think there systems would work in the USA. It is easy to have a federal bankrolled healthcare system when you have such a small population and a much higher tax system. It is also much less expensive to run social programs when you really aren't responsible for keeping a strong military force (not only numerically but from a military weapons development stand point.) As nice as the social programs are in Canada and Sweden, I just don't see how a larger country with all our global responsibilities and a large population could sustain a healthcare system like theirs.