>I will never understand the general lack of goodwill towards one's fellow countrymen
Homogeneous populations are required for this. When the US was least diverse, during the 1930s-60s, the public was largely supportive of public social welfare. Despite right-wingers guffawing over European nations importing more "diversity" of late, the US is way ahead in diversifying the nation into islands of "diversity" with a rump "historic" American nation in the outlying surrounding areas. The "diverse" populations (and their "historic" allies) are inculcated with neo-Marxist propaganda that frames the people whose nation they are invading and whose largesse they are seeking to exploit as class enemies. The "historic" population has long sensed this animosity but cannot articulate it publicly and oppose it in a straightforward manner without their opponents, including the vast majority of major media, ostracizing them as dangerous lunatics. The "diverse" are deemed inherently virtuous while the "historic" inherently evil -- blood libel updated for the 21st century. What sane person who is a part of the "historic" American population would support having most of his money taken in tax to support a growing population of people who do not share his ancestry, culture, or values and who view him as inherently evil? Thus we see opposition to social welfare programs that disparately impact/benefit the "diverse" populations.
TL;DR: Most "Americans" are not "fellow countrymen" at all but distinct factions engaged in a simmering war with each other.
Alright, I'm the creator of this user account and the one that made it public, and I'm going to claim it back now. Maybe I'm a dumb kid, but I think if any country can maintain a highly diverse population without internal "simmering war", it's the US. The greed of hospitals is not somehow explained by xenophobia. Generations of people born in perverse power structures, doing their best to strengthen and reinforce them, seems much more suitable of an explanation. Genetics will mix and people will evolve. Deal with it.
Um... have you not noticed that a large portion of those providing medical care in the NHS are those same immigrants? Immigrants by and large are equal parts of the solution to problems. If you remove them all, you will quickly realise that most of the problems still remain caused by those who will continue to be ungrateful and just blame something and someone else for their problems.
Homogeneous populations are required for this. When the US was least diverse, during the 1930s-60s, the public was largely supportive of public social welfare. Despite right-wingers guffawing over European nations importing more "diversity" of late, the US is way ahead in diversifying the nation into islands of "diversity" with a rump "historic" American nation in the outlying surrounding areas. The "diverse" populations (and their "historic" allies) are inculcated with neo-Marxist propaganda that frames the people whose nation they are invading and whose largesse they are seeking to exploit as class enemies. The "historic" population has long sensed this animosity but cannot articulate it publicly and oppose it in a straightforward manner without their opponents, including the vast majority of major media, ostracizing them as dangerous lunatics. The "diverse" are deemed inherently virtuous while the "historic" inherently evil -- blood libel updated for the 21st century. What sane person who is a part of the "historic" American population would support having most of his money taken in tax to support a growing population of people who do not share his ancestry, culture, or values and who view him as inherently evil? Thus we see opposition to social welfare programs that disparately impact/benefit the "diverse" populations.
TL;DR: Most "Americans" are not "fellow countrymen" at all but distinct factions engaged in a simmering war with each other.