Under the circumstances I do not blame the US for using Nazi scientists for their own benefit. Even today if they could recruit Iranian nuclear scientists I think they should. Would you prefer they continue to work for Iran?
People like Wernher von Braun (who lied repeatedly about his involvement with the SS)
was an evil person but the American veneration for him and his work in NASA was due to believing revisionist history and Braun’s lies. Not because they forgave his Nazi past