Hitler may have been the leader during that time, but he was hardly the cause of any of it. He drove out a major portion of the brainpower, and the Allies benefited from it. And they were never prosperous during his term. As far as technology goes, yes, they were smart, but who ended up with it? Like you said, with the reference to NASA. The USA put down 2 empires in the same time period, one german, one japanese. Looks like the USA was the most advanced and prosperous. We didn't do it alone, but the industrial might of the USA and its people supplied the majority of it.
What he did cause was the death and destruction of the german people, but then they deserved it. They voted him in. Germans are still smart people, so smart that they have made neo-nazi crap illegal in their country.
You can keep the dream alive, if you wish, but there are very few like you in the world dreaming about a failed past and hoping somehow that it can be born again and be successful the next time around. The KKK guys think the same thing about the confederacy, and that won't happen either.