German Nazism could not have succeeded in establishing itself except as a result of the theoretical contributions of Fichte, Goethe and Nietzsche, coupled with the ingenious and mighty leadership of Hitler and his comrades.
Although we deal with probabilities and expectations, the actual results can deviate substantially from such expectations, particularly on a short-term basis.
In my personal experience I have hardly come to know the wretchedness of mankind better than as a result of the general theory of relativity and everything connected to it. But it doesn't bother me.