---------------------
Hitler's magical thinking. Hitler's will was so strong, expressed through the German People, that military realtiy no longer mattered.
Hitler came to believe that, like God, his words could make or unmake reality itself. It is amazing how gullible people can be, and how carried away by their own emotions they can be.
In a way, Stalin suffered from the same problem. Though probably less insane and certainly less charming than Hitler, Stalin simply refused to see the complete chaos collectivization wrought upon the breadbasket of Russian, the Ukraine. Instead he simply shot anyone who hoarded grain to feed their families.