I’ll give Von Braun a pass. He was a fanatic, but only about advancing rocketry. And with the rapid post-war development of the Cold War he was clearly a key asset as the most knowledgeable scientist in the world on the subject. Stalin managed to collect more high end German hardware than the west, but the west managed to collect more high end German brains. Both side’s technology lept forward from their loot. But over time the brains proved decisive.