Hiroshima was a military target and it was home not only to Civilians but 2 major Land Battalions and many Military Heavy Arms Factory.Am not too sure about this, many historians, and my own history teacher at school told me that at the time Japan was already on the losing end.....
Russia was also working on the bomb, and this could have been also to signal Russia that the US was not afraid to use the bomb.....
Anyway, in a war actually everyone is losing, cause you are still killing.
I have always asked this myself: from all the targets why must you drop this bomb with this power onto a city with innocent people? Why not on an army target, or a harbour? Or drop into the sea in front of Tokyo as a warning to show the power?.......
The americans have a famous saying for civilians killed during war: 'causalties'.....(forgot the exact wording), I don't think this was 'casualties' as it was well known you would kill innocent civilians......
Hong Sien
As for the saying, the word is 'collateral damage'. Its like.... playing Starcraft and u utilise Seige Tanks on the Confederate side, ur infantry's fighting Zerg Bugs and u decided to use Seige Tank to clear the area. 1 hit, Zerg die, ur Men die too.
Well, but anyway, its war and the consequences are expected. If a country's politicians decided to drag the whole country to war, both Soldiers AND Civilians will suffer. There's no such thing exactly as a 'fair game' or 'fair target' in reality.
As for dropping the A-Bomb into the sea, well, no one at that time would know what happen (except for an ubber large explosion) thus US simply singled out a single city to show what 1 single bomb can do to a city - flatten it in 3secs without needing to do Carpet Fire Bombing.
Of cos, supposedly even their own Allied POWs held in Hiroshima & Nagasaki were vapourised unfortunately.