Inasmuch as the atom bomb was developed and used AFTER Germany surrendered, you'd probably hurt quite a few American occupation troops if you'd tried dropping nukes.
You know what? The Americans were using science derided by herr hitler as "Jew science" to develop a bomb which would be used to end that horrid war. A war... that hitler and his Germans started.
Well, let's just say this. It would have been so supremely ironic if herr hitler had gotten one of those bombs dropped right on him in Berlin.
Hooray for Einstein, Bohr, Fermi and Oppenheimer!! And all those many others who helped to develop the BOMB!! It took just TOO, TOO LONG for herr hitler to get the full force of said, "Jew science". A force that he and his nazis so richly deserved.