I posted this in EU and not poli/religion intentionally as a memorial, and not a debate.
Something to be mindful of here-http://en.wikipedia.org/wiki/Operation_Downfall
Operation Downfall had two parts: Operation Olympic and Operation Coronet. Set to begin in October 1945, Operation Olympic was intended to capture the southern third of the southernmost main Japanese island, Kyūshū, with the recently captured island of Okinawa to be used as a staging area.
Later, in spring 1946, Operation Coronet was the planned invasion of the Kantō plain, near Tokyo, on the Japanese island of Honshū. Airbases on Kyūshū captured in Operation Olympic would allow land-based air support for Operation Coronet.
Japan's geography made this invasion plan obvious to the Japanese as well; they were able to predict accurately the Allied invasion plans and accordingly adjust their defensive plan, Operation Ketsugō. The Japanese planned an all-out defense of Kyūshū, with little left in reserve for any subsequent defense operations.
Casualty predictions varied widely but were extremely high for both sides: depending on the degree to which Japanese civilians resisted the invasion, estimates ran into the millions for Allied casualties and tens of millions for Japanese casualties.
If the decision to drop the bombs had not been made, or if the warrior spirit had won out in Japan, Operation Downfall would have taken place.
The atomic bombings certainly saved many Allied lives, and although it was not their intent at the time, and as horrible as the weapons were, the bombs also saved many more Japanese lives than they took.
These were the final big blows that brought the Second World War to a close, and although it was a terrible thing, it actually could have been worse. Americaís graveyards would have been a lot fuller; many of the men that fought, including my great uncle who fought north through Italy and then went as far as Okinawa, would not be alive to tell their stories now.
In contrast, the 1980ís boom in Japan would likely not have occurred; they would have still been too busy rebuilding.
All this taken into account, I would say two was quite sufficient. Two was tragically two too many.