> To the extent that high value workers knew that they were treasure to be looted they might have decided that the US was a least worse option.
Yes, that lines up with von Braun's account of his motivations.
> 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 not by the laws of materialism but by Christianity and humanity could such an assurance to the world be best secured.
I'm not particularly convinced by this man's praise of America and talk of Christianity, I think he was brown-nosing just a little bit... but it does seem clear he preferred America to the Soviets.
Allied bombings of Germany began in 1939, the information is even present in the Wikipedia link you provided. V-2 launches against Allies started in September 1944, well after commencement of large scale strategic bombing of German cities, and the name was given to it after successful test launches, also in 1944.
To the extent that high value workers knew that they were treasure to be looted they might have decided that the US was a least worse option.