In the only known recording of Hitler's normal voice, Hitler in his own words explains the USSR made vaguely threatening remarks about Germany's oil reserves in Romania, how the USSR had enslaved its own population and wanted to enslave more of Europe (and the world) for communism, and how the USSR likely was going to invade Germany and Barbarossa was a premptive strike.
This primary source is more believable than some 3rd hand source from the (((activist organization))) teaching kids that Hitler was "insane" and wanted to rule the world.
My question is, how sound is his military strategy points he talks about?