There is no significant evidence that Japan even surrendered because of the bomb. "In a recently released Harvard University Press volume drawing upon the latest Japanese sources, for instance, Professor Tsuyohsi Hasegawa concludes that the traditional myth cannot be supported by historical facts." (http://www.commondreams.org/views05/0803-26.htm)

"The bomb was used partly to justify the $2 billion spent on its development." The money that was used to build it wouldn't have to have been used if they found peaceful ways to end it

"...strategic bombing,...has already rendered millions homeless and has destroyed from 25 to 50 percent of the built-up area of Japan..." (report from Combined British-American Intelligence Commitee to the combined Chiefs of staff, July 8, 1945)

"Since then [the bombing], thousands more have died from injuries or illness attributed to exposure to radiation released by the bombs." (http://dbp.idebate.org/en/index.php/Debate: BombingHiroshimaandNagasaki)

The atomic bomb was dangerous and inhumane towards the Japanese, therefore there should have been a peaceful ending to the war