Bottomline = the bomb saved aprox 50,000 american lives!!!and $$$$$$$$$$$
Bottom line...The Bomb incinerated tens of thousand Japanese civilians. Harry Truman went on to kill about 50,000 Americans in a futile war in Korea.
Thankfully those of use who are conversant with all the historical events surrounding the cause and prosecution of the Korean Conflict know it's much more complicated than you portray not to mention all the historical facts surrounding the dropping of the atomic bombs on Japan.