Should the U.S. have dropped the bomb on Hiroshima?

On August 6th, 1945, under the authoration of Harry Truman, the United States dropped an Nuclear bomb on Hiroshima, Japan. The bomb killed 140,000 people, some instantly, while others suffered hours to try to survive. Thousands more died later on in the year from radiation poisoning. Was dropping the bomb really the best way to solve issues with the Empire of Japan? I believe it was the right thing to do. Out of no where, Japan attacked Pearl Harbor, Hawaii. They killed thousands of American soldiers and injured many more. Japan started the attacks and the United States had to finish it. Obviously, there was a lot of concideration in whether the bomb would be dropped or not, and the President must have decided it was the only way to end the war. They didn't really want to kill the innocent people as much as the Japanese soldiers, but sometimes those things happen. After the attack, Japan signed the Instrument of Surrender, ending the Pacific war and in turn WWII. Japan also had to sign the Three Non-Nuclear principles, saying it would not use nuclear weapons for armament. The bombing of Hiroshima was a terrbile thing and hopefully the U.S. will never have to make such a decision as that again. As our dear friend Jackie DeShannon once sang "What the world needs now, it love, sweet love."