I totally accept the argument that it's not the same thing to run a country of 10 milion versus 325 million, but why does demographics matter so much? A lot of

I totally accept the argument that it's not the same thing to run a country of 10 milion versus 325 million, but why does demographics matter so much? A lot of the differences between Sweden and the US comes down to things like whether health care should be a human right etc. Do you think people are less inclined to want "free" health care if they live in a community that's ethnically mixed? I don't buy it.