And Truman and the rest of America had to live with the decision that these tactical strikes saved what some analysts were predicting to be in excess of hundreds of thousands of casualties trying to take the home island of Japan by invasion. "Kill Them all, God will know his own" was used by a Christian leader ordering the Albigensian Crusade. We can "go down fighting" against Fundamentalist Islam or we can submit. I choose the first as my tagline states. In war (especially the type of non-conventional war that we are currently fighting), this area becomes extremely blurry and I don't believe that Truman was wrong. I was agreeing with sentiment expressed out of frustration, I am quite sure, that we "take the gloves off". I am not going to hang around to discuss the morality of Truman's decision.
On a final note, the atomic weapons used against Imperial Japan was not part of policy to eliminate the entire race of Japanese.