Why the dropping of the Atomic Bombs were unjustified

The bombings of Hiroshima and Nagasaki by the United States were unjustified because there were better ways of getting the Japanese to surrender, the tension it would cause against the Soviets which would lead to the cold war and near Nuclear Armageddon, and Truman failed to see how powerful this weapon actually was.

Photo taken a few moments after the bomb was dropped on Nagasaki