The US is all about realpolitik, and begins to make a lot more sense when you look at everything through a Kissinger-shaped lens (rest in piss, you evil bastard). We pretend to be ideological so our citizenry can feel good about ourselves, but the way the nation operates is purely pragmatic. Look no further than Israel-Palestine and how buddy-buddy we are with Saudi Arabia for modern examples. Even our support of Ukraine, while overlapping with an ethical imperative, is driven primarily by the interests of NATO and the relatively inexpensive degradation of Russia’s military and political standing we can participate in. We only give a shit about “human rights” when it benefits us.

Operation Paperclip was pragmatism. It creates a sense of cognitive dissonance when we try to hold in our minds that we brought Nazi scientists over and the idea that we’re “the good guys” and fought for “justice,” so our brains try to reduce that cognitive dissonance by saying those scientists weren’t behind any of the evils of the Nazis. They were, obviously. That didn’t matter to our government, but they kept the operation classified for a reason.