Seems to me that you're choosing the side of weakness and eternal defeat if you go to war simultaneously with the British Empire, with its population of 700 million, the Soviet Union, which stretches across ten time zones, and the USA, with the world's largest industrial economy.
Hitler could have beaten the Soviet Union, if he had promised to “liberate” Russia, and even make Russia a puppet state, much like Vichy France. A lot of Russians probably would have preferred that over Stalinist tyranny, and might have even fought alongside the Germans.
Logic was never Hitler’s strongest ability.
Remember, the only good thing Hitler did was to shoot Hitler.