Also, Hitler felt humiliated by the fact that he was unable to invade England, so thinking Russia was weak, he hoped to win a quick war in the East. But of course as said, his invasion of Russia was not quick enough, and so the Russian winter got him. Moreover, Hitler, wanting to keep the support of the German people, thought he could have both guns and butter, thus he did not fully mobilize Germany’s industry for war until it was too late, and allied bombers were laying waste to German factories.