After what happened in Pearl Harbor yeah he did the right thing!

Following orders, you don't question your commanders, just follow their orders. It came from those higher up the command, ultimately the Commander and Chief.

As the city disappeared under a mushroom cloud, Captain Robert Lewis – co-pilot of the Enola Gay, the bomber that dropped the weapon – wrote in his log “My God, what have we done?”

Three days later the U.S. released another atom bomb on Nagasaki, devastating the city and ushering in the nuclear age

https://z3.fm/mp3/search?keywords=ub40

maybe when a bomb is dropped on your precious little wifey and kiddies you'll know if your one big thing was right

And you're gonna tell me that America The Great was intimidated by a bunch of little airplanes tooled for suicide attacks and flown by pilots who had no more than 6 hours of total flight time training under their belt and because America was so totally intimidated by all that, you can now stand there and justify Truman acting on his own when deciding to unilaterally bomb Hiroshima and Nagasaki and then justify his actions to the entire world in the name of National Security? Your answer better be f'ing good!