Well Von Braun did work for the nazis but he probably figured he was using them as much of them using him kind of situation. It was a way to fund his research into rockets, during thye cold war scientists used goverments on both sides to fund their research. I heard stories of one scientist using getting funding for a blockhole bomb just to get funding into blackholes, and another coming up with the idea of antimatter fighter to get funding into antimatter.

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If it's just us, it seems like an awful waste of space.
Contact Carl Sagan