I recall that someone, possibly in Truman's cabinet, noticed that many of Truman's advisers had visible injuries from long-ago fights. This individual commented that their rough upbringing including settling differences by fighting might have influenced their decision to deal with Japan severely.
Who made this observation? What were the details? What are some commentaries from modern historians on this?
EDIT: All I am asking here is about the idea that the boyhood experiences of Truman advisers may have had a bearing on the decision to use the a-bomb -- primarily I am interested in who actually said this (and what exactly was said) and whether any other historians agreed or disagreed.