the usual "We didn't need to drop the bomb!" cries and condemnations are going 'round again. The people yelling this either don't know or don't care just what would've happened had we not.
Lance or spear practice was a regular women's exercise to practice for the anticipated U.S. landing. My uncle, who was disabled, had been sent to a mandatory training camp to practice with wooden bullets and makeshift weapons to do his civilian share in greeting American forces. Then the bomb was dropped and it was over. Those who recently protested the Hiroshima and Nagasaki bombings don't have a grip on the grim reality of invasion that both Americans AND Japanese were facing. When I first visited the Hiroshima museum, I, too, had been overwhelmed with pity, sorrow, and anger. This was before my family explained to me what the consequences would have been if those bombs had not been dropped.
I recommend this (pdf), Thank Gods for the Atom Bomb.