The very topic of atomic bomb use in Japan during World War II sparks many different views about what should have been done. The United States Government made the decision to drop an atomic bomb over Hiroshima and Nagasaki, totally destroying both cities. The use of one atomic bomb was necessary in Japan. The second was unnecessary and inappropriate.
The right decision had been made to drop the first bomb.
The use of the bomb on Hiroshima might have actually saved lives for both the United States and Japan in the long run. By using it, the Americans were saved from having to make a land invasion on the Japanese main island, and thus saving an estimated one million lives. Also, according to previous invasions of other islands in the South Pacific, the Japanese would have lost two people for every on American lost. The result might have been two million or more Japanese dead. The Japanese made the decision to try and overtake the worlds largest superpower, and they had to face the consequences in one form or another.
The use of the second bomb over Nagasaki was not needed.
The Japanese were already learning that fighting the United States was becoming futile, and the first bomb on Hiroshima had produced the desired effect. It drove home the point that Japanese empire had gone much too far. They had seen the mass devastation the new technology could produce, and there was no need for a second show of it.