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USA is special in their minds because of how willingly cruel we can be/have been.
It's very much the opposite. The propaganda narrative of American Exceptionalism is that the U.S. is morally superior. We aren't peasants ruled by some far off king, we rule ourselves with a democracy! Society isn't dominated by aristocratic failsons, your success or failure is based on merit! There's so much opportunity here, anyone can make it if they work hard! Capitalism raises all boats! We never had anything so gauche as an empire, we managed a bunch of territory for a while but either granted them independence or made them states! We're the only country to win a bunch of land after a major war and give most of it up!
Of course the reality is far different, but that's the American Exceptionalism narrative. The whole idea is that we aren't just another great power, we're the good guys. A shining city on a hill.
I don't think it's quite this, certainly not in lib circles, and I don't think it's even common among Republicans. The justification for empire comes more in the form of "every non-ally is an evil authoritarian nightmare country that's impoverished and backward and has a rogue government that will kill untold numbers of people because they're evil." And would you rather have us running the show, or them?? Throw in a sprinkling of "they will greet us as liberators" where appropriate.
There's a real resistance to thinking of America as an empire. A ton of propaganda effort is poured into the idea that America is fundamentally good, and the bad parts were either isolated lapses or regrettably necessary to keep the barbarian foreigners from winning.