I can think of no reason to lose the life of one American to save the life of one, ten or one hundred million attacking ruthless barbarians.
It is truly sad that so many people who did not make the decision to kill 3000 Americans while they slept on a Sunday morning without warning had to die for the decisions of those that did. I do not weep for those Japanese who died but am glad for those Americans who were allowed to live because Little Boy and Fat man were dropped.
It is wrong to think only of the harm caused by the Atomic Bombs while not considering the death and destruction caused by the Axis powers. Japan was ruthless, had they had the bombs they would have been dropped on New York and Washington, D.C. without hesitation and all of us today would be speaking Japanese.
Japan actually did bomb the mainland US during WW2 and it was, by definition, an unguided terror bombing. By 1943, the Japanese military realized that they had a unique advantage over the US (and Canada) called the prevailing wind. Using a hydrogen balloon made of laminated paper and a well thought out timing and flight plan, Japan could unleash thousands of incendiary and even biological bombs on the western US.
Implemented in 1944, it is estimated that only about 20% of these devices made it to the US and Canada but at least one made it all the way to Michigan. In May of 1945, one of these caused the only mainland US casualties of WW2 when a church camp group in southern Oregon set one off. The US Government had known and kept secret this Japanese campaign because it feared that news would encourage a much larger campaign by the enemy. Since these weapons were near impossible to spot en-route, were easy & inexpensive and potentially very deadly if used for rabid bats or worse, this was a high government secret.
Maybe, even today's liberal media would have kept it a secret, MAYBE!