Dropping of the atomic bomb in Japan(WWII) America's use of the atomic bomb against Japan been justified? Was it used to end the war? It probably wasn't necessary, but without doubt , the atomic bomb was used to end the war and it saved American lives. but was it right to kill a hundred thousand of Japans? President Harry Truman had to options: One of them was to use the atomic bomb and end the war, and kill thousands of innocents. Or the second option which was a wage war in the air, land and sea approach and probably allowing another attack on the U.S and prolong the war. The utilitarian concerned solely with the American intrests would certainly agree with President Trumans decision to use the atomic bomb. It provided the best benefits to the number of Americans. Today's mankind should also agree with the American development and the use of the atomic bomb was the right choice, because it provided the best benefits for not only America but for the humans as well. The use of the atomic bomb prevented prolonged ware fare, and also prevented the future from using the atomic bomb.The presidents action of dropping the atomic bomb on Japan showed the world the consequences of nuclear ware fare and future envolvments of a future world war using atomic bombs, which would most likely result in total annihilation of humankind.The U.S cannot be blamed for the invention of nuclear weapons. The U.S developed the power first, and the development of the atomic bomb helped to develope nuclear power as a energy source.It looks like the president and the U.S were right in dropping the atomic bomb in Japan. Theory: The great 19th century philosopher John Stuart Mill states , “Utility, or the Greatest-happiness Principle, holds that actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness” (Mill 15).