Unthinking Majority wrote:America exists to serve the interests of Americans, first and foremost. It's not a charity development project for all 7 billion people in the world.
But stating this fact does not make it morally right. The US acts selfishly and unjustly as do all sovereign countries. In this it is fundamentally no different to Nazi Germany. Obviously it was a good that Nazi Germany was brought low, but this was not due to German nationalism being fundamentally worse or fundamentally more selfish or unjust but just due to the dynamics of Germany's late unification. Opposing Nazi Germany was a case of opposing the greater evil, the more powerful and virulent selfishness.
When you hear the pathetic fantasies about world War II you would think it was some great conflict between good and evil. In fact only Britain, its Commonwealth and the French empire went to war against the Nazi without being bribed, arm twisted. They were supported to some extent by the US, who were too cowardly / selfish to actually fight.
The great irony is that the British, French and US empires were in the least position to complain morally about Hitler's empire building. Yes moral considerations were an important factor. But it was considerations of national selfishness that determined that Britain and France went to war against Hitler, Democratic Finland went to war with Hitler and the other democracies just kept their heads down.
As I see it we entered a moral crisis with the collapse of the Western Roman Empire. For the people of the Roman empire, Rome was in effect the world. Other empire's existed but most of Rome's people had no interaction with them. When Rome became Christianised people lived under a human universalist ideology, in a universal empire a universal polity. During the Middle Ages the separate countries, the separate jurisdictions could be justified by the divine right of Kings, monarchs ordained by God. King Charles III claims to be God's Christ in Britain, God's Messiah, God's anointed one. Before the reformation sovereignty at least in the West was heavily curtailed.
In the modern world, we have not merely maintained Christianity's human universalism but intensified it. There is no moral justification for independent countries and their national citizen privileges.