Every weapon is an "expedient" and all are designed to end the conflict as soon as possible in order to save lives. That is exactly what happened wrt Japan. There appears to be no issue here except to those who want to limit America's use of its power.
Propaganda is not necessarily false in any case and it is not in this one.
PS, don't pay attention to spanalot anymore. You;ll sleep better that way.
Secondly, I don;tobject to the notion that "every weapon is an expedient" but I do object to the notion that instant vaporization of people (or a slower, more painful death due to raditation sickness and cancers) is more "humane" than slow starvation, immolation via napalm, or a bullet to the brainpan.
Death is still death, and a violently inflicted death, regardless of how quick and painless, is a violently inflicted death. The great crime of WWII is that death and destruction were PURPOSELY visited upon those not directly involved as a matter of strategy and policy, and the technology and ideologies existed (and evolved) to make those things commonplace, and not something reserved for the bad old days of Atilla the Hun and Ghengis Khan. I know this is not the first time such things have happened in the history of warfare, but you would think that at perhaps some point someone would have protested (and I know many did) at this type of barbarity.
What were once considerd criminal acts beyond the pale became the standard operating procedure of the Second World War.