Are you saying that U.S. leadership is responsible for the murders of those that were killed in the strategic bombing of Japan? If you are - then you are wrong.
This is a good questions and deserves an answer. The decision to murder one hundred thousand human beings was made not by the leadership of the United States but by the Japanese Imperial command when they decided to start and continue the war. So the blood of these people is on the hands of the Japanese Imperial Command and none else.
This is also the case when a murderer is put to death for their crime. The murderer is responsible for the person he killed and his own death; the state who put him to death is not responsible for his murder.