The hard truth is that the atomic bombings were unnecessary. A million lives were not saved. Indeed, McGeorge Bundy, the man who first popularized this figure, later confessed that he had pulled it out of thin air in order to justify the bombings in a 1947 Harper's magazine essay he had ghostwritten for Secretary of War Henry L. Stimson.

http://www.truthout.org/docs_2005/080505E.shtml