Germany had to try and find some experimental uberweapon to save the day against the B-17s and Lancasters the Allies were producing by the hundred. The German economy was too small to give any hope of matching the Allies directly. Even if Germany had defeated Russia, they probably wouldn't have been able to integrate its resources well enough to expand production enough. So they had to search for new whizz-bangs and hope that one would work. The Allies had the luxury of not needing to do that, they had enough production capacity to defeat Germany with proven and evolutionary designs, if the Manhattan Project wouldn't end the war first.
German physicists presented the idea of an atom bomb to the armaments leaders in 1942, including Albert Speer. They were impressed, but turned the project down as it would take too long to complete.
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