For what reason does Col. Tibbets support President Truman's decision to use atomic weapons?

Col Tibbets was the American pilot who dropped the atomic bomb on Hiroshima, Japan in 1945. Later, he told an interviewer that he supported the decision to drop the bomb and that he "never lost sleep over it." For TIbbets, dropping the bomb on Japan was a way of shortening the duration of the war and saving the possible millions of lives - both Japanese and American - that would have been lost if the U. S. invaded Japan,