You're implying that von Braun was still a nazi when he was working in the US (he wasn't) and you imply that Elon Musk is a nazi in the first place when he's done nothing to indicate that.
Well, the Nazi party was banned permanently by the Allied powers on Oct 10, 1945, so technically every member still alive became an ex-Nazi at that point. Including the leaders later hanged in Nuremberg, and, of course, Wernher von Braun.
Of course some people say that once a Nazi, always a Nazi.
Of course some people say that once a Nazi, always a Nazi.