Why did Henry L Stimson decided to use the atomic bomb?

Henry L. Stimson, the U.S. Secretary of War during World War II, supported the use of the atomic bomb primarily to expedite Japan's surrender and bring a swift end to the war, potentially saving countless lives on both sides. He believed that using the bomb would demonstrate overwhelming military power, thus compelling Japan to capitulate without the need for a costly invasion of the Japanese mainland. Stimson also thought that the bomb's deployment would strengthen the U.S. position in post-war negotiations and deter future aggression from other nations.