There were hundreds that were military targets, munitions factories, ports, naval yards, etc - all could have been targeted by conventional weapons. The same military targets could be destroyed - certainly some civilians would be killed in any bombing, but far from the estimated 120,000 of Hiroshima and 75,000 of Nagasaki. I would have bombed with everything I had short of nukes, or used nukes on a naval fleet, but not against civilians.
Again, I acknowledge that the military is prepared for war and is universally recognized as a legitimate target. I still question why you are so eager for your family, your newborn baby, child or grandmother to be considered a lawful target by our enemies.
If you have any evidence that the United States targeted grandmothers and newborns at any time during its existance, then submit it.
Otherwise STFU about it.