re: #24 Kragar (Proud to be Kafir)
Hiroshima; headquarters for the entire southern defense district which was where we would have had to invade.
Nagasaki; Major rail center and munitions stockpiles which would have been used as a hub to transfer troops and materials in the event of invasion.
They weren’t chosen at random and they weren’t picked because they were civilian targets.
I have read a very solid argument that the bombs weren’t the only reason for Japan’s surrender. Russia’s declaration and move into the region was also a big deal.
That said, yes, they were valid targets.