Regarding paperclip, the US grabbed leaders, program architects and STEM bureaucrats. These types of people can’t really have their knowledge or skill extracted, then be discarded.
I’m not excusing any behavior here, but folks like von Braun bargained for what they got and the US gov cared more about rockets than principles.
I expect von Braun and friends would have had similar treatment in the Soviet union, had the soviets been lucky enough to catch them first