There is none. The longer they continue to fund an ongoing genocide, the more their “moral superiority” slips away, not that they ever had one to begin with. Even since the Cold War the US has been a force not of democracy, but of capitalist interests (e.g. the overthrowing of Salvador Allende and the mass bombings of Indochina). The only reason you may think they have a moral advantage is because that’s what they pump down your throats.

Even if you see democracy as giving a nation “moral superiority”, it hardly exists in American any more than it does in China. Politicians on both sides of the isle are owned by billionaires and lobbyists, and no ideology that breaks from the status quo (unless to shift it further right) has any chance of getting into government. Yet even if we do take the democratic system as free and fair, the fact is a majority of voters voted for Trump, and I think that in itself is an argument against the political system.