If I understand you, you are saying that Roosevelt and Churchill chose the wrong side when they decided to ally with Stalin against Hitler, rather than with Hitler against Stalin--that the world would have been a better place than it actually was if the Nazi tyranny had ruled Europe for, say, fifty years after 1945.
I think that you are completely wrong. The Nazi death count is less than the Stalinist death count (if it is: it is not clear to me that it is) because the Nazis were *stopped*. Remember: the Nazis envisioned the demographic replacement of the peoples of Belarus and Ukraine by ethnic Germans--that's 50 million shot, gassed, starved, whatever right there. Recall that of the 3.5 million or so Russians who fell into Nazi hands as POWs in 1941, barely a quarter were alive a year later. If Jews were smart, deceptive, clever beasts to be exterminated; Slavs were dumb, stupid beasts to be exterminated.
And what do you think the fate of Africa would have been with Hitler and his ideological fellows ruling Europe for half a century?
As it was, the Grand Alliance against Nazism was a very near-run thing. Had things gone even slightly worse on the battlefields, we would now be looking back at a second half of the twentieth century full of horrors that would dwarf the GULAG or the Great Leap Forward. Think of Pol Pot on a Eurasian scale--that's the consequence of a Nazi victory in World War II.
Brad DeLong