@"Russians Did Spaceflight on their own"
I do think careful analysis of your own words will contradict your own general line of arguments:
Wikipedia has some information on this:
Of course, "what one man can do, others can potentially do, too". But that doesn't invalidate that first-rate, rigorous German education plus the money, rigour and military efficiency/rationality of the German state developed liquid-fuelled rocket motors into a perfection that would make space-flight possible.
America and Russia COULD have done the same, but they were focussing on different stuff like nuclear weapons, electronic warfare, cryptology, making bombers and tank mass-manufacturing.
I stick with the argument that modern-day rocket motor technology is essentially the same as what von Braun developed for the Wehrmacht as a weapon. Of course, von Braun stood on the shoulders of many rocket pioneers from Russia and America, but he was the guy who was single-minded enough to make it REAL.
Similar arguments could be made for the jet engine and as far as I know, the Tu95 strategic bomber still runs on an engine designed by German engineers who were captured. It still is the most powerful turbo-prop in existence. Plus, it is probably the loudest engine in service. You hear the nukes coming.
And before you say "that's all Deutschland-über-alles arguments", I will easily admit that German cryptology was essentially shite, radar wasn't really good and the nuke efforts were also amateurish. Surely killing people cold-blooded is evil. I have to note on this account that the British and Americans were executing spies, though. Not really cool.