Long story short, Japan was a dick, got nuked, now it's a hello kitty.
A moral of this story: Nukes hurt, but help finding your proper calling in life. Okay, Germany wasnt nuked but only because they folded and surrendered before Truman decided to nuke them as well - at least thats what Gen.Groves related in his memoirs and like all generals, he was eager to nuke everyone with this new fab bomb if he had the carrier capability yet he STILL told Truman that it would be a daunting task so maybe Germany won the lottery on this one. So an amendment for the above moral: Nukes hurt, and if you manage to get rekt before they are used anyway, you will find your proper calling in life.
Germany was bombed much more intensely than Japan. A nuke wouldn't add much to the repeated carpet of bombs the allies laid on them, except for radiation effects.
German civilian casualties due to bombing: approx. 500,000
Japanese civilian casualties from Nagasaki and Hiroshima: approx. 130,000 (with several thousand more from cancer later)
Quite stunning for 2 bombs. And bear in mind that the Japanese population is significantly smaller.
Point was, as reiterated by Groves, that AA defenses and overall issues with Soviet Union would make that unfeasible anyway. Most historians concur with this point. Also, firestorms caused by Allied bombings were much more lethal than the use of both nuclear bombs in Japan. With nuclear armaments, as Eric Schlosser points out in his book DEAD HAND, it was a question of quality over quantity in terms of the amount of ordnance delivered in comparison to "classic" explosives.