Because each individual western state has their own unique universal healthcare system that covers their relatively small populations only. The same would not be true in the United States unless all 50 states had their own universal healthcare system.
I’ve said this in other threads, if the European Union creates a universal healthcare system that covers their 500 million or so population and it works out to be both sustainable and better than what we have then I will take the universal healthcare across the United States debate seriously. The fact of the matter is we have never seen a universal healthcare system anywhere near the size and scope of one that would be needed here.
That also ignores the constitutionality of such a system, but I’ve no desire to get into that.