In May 1945, von Braun had to decide whether to surrender to the U.S. or the USSR. This is how he described the decision:
We knew that we had created a new means of warfare, and the question as to what nation, to what victorious nation we were willing to entrust this brainchild of ours was a moral decision more than anything else. We wanted to see the world spared another conflict such as Germany had just been through, and we felt that only by surrendering such a weapon to people who are guided by the Bible could such an assurance to the world be best secured.
Draw your own conclusion about his ethical compass.