Those countries are smaller and most likely have more functional governments than the United States. Having a dysfunctional government is a feature, not a bug, but it does mean that the national government would do a bad job running the health care system.

Germany's nearly 90 million people. What about a 90 million person health system can't be done with 300 million? At what point does this magical impossibility kick in?

No, but we need to have a nice long talk about how much the lot of them free ride on the US healthcare system to develop drugs, treatments, and more.

Having just visited the EU I can tell you the working folks in those socialist countries are pissed they have to support immigrants who arent contributing.

Its not all roses over there