Well let's not do anything hasty

You might think that it's "experiments", but "medical knowledge" is doing a lot of heavy lifting in that sentence too, the US was predominantly interested in Japanese bioweapons research

What do we do with the naturally born Nazis vs the Nazis that were forced to be Nazis.

You actually believe that? The people who claim that people like Werner von Braun didn't commit any crimes are the CIA and Braun himself. All of the records from Germany were destroyed. It's essentially just taking his word on it to believe he was only involved because "he had to be."

He was literally a member of the SS, the wing of the nazi government that was directly responsible for the Holocaust. He was photographed repeatedly with himmler himself, in uniform. He claimed that those were just ceremonial photos that he had to participate in the keep his career. He also claimed not to agree with the Nazis politically.

Why would you believe anything that a member of the SS said? Especially one as important to the Nazis as von Braun was.

Of fucking course he was never found guilty of any war crimes, the US was actively trying to recruit him. They didn't want to prosecute their newest asset, a man who directly led to the US becoming the globally dominant force it became during the space race. He was useful so the US government deliberately didn't investigate him seriously, took him at his word that he totally wasn't a real nazi, and then used him to invent more rockets for them.