Justification of Nuking Japan’s innocent people is really embarrassing… I accept the Japanese Leaders were hopeless morons who had the mad fever of war. I also accept Nuking Japan helped in ending that war, pretty early. But the A-Bombs dropped can’t be justified with these diplomacy ! America could have just demonstrated its strengths by dropping the Fat Man onto a desert or unpopulated area near Japan (Correct me if I am wrong, similar advise was give by Einstein)… US will permanently have the blame for a right cause. I think the president was under influence of the Reckless Military Generals of US at that time…. 
In conclusion, I want to say : I accept that A-Bombs ended the war quickly, I accept Japanese Warlords were insane and cruel, but a Demonstration would have done the same effect without the permanent injury to Mankind….