Quote from emg:
there were already losing since the battle of midway in 1942. By spring 1945, they loss saipan, guam, Philippine, east asia, etc etc etc.
If it wasnt for the A-bomb, the u.s victory of the battle of Okinawa, will enable u.s to invade Kyushu, and then onto Honshu. And at the sametime, the russian would have invaded Hokkaido.
The A-Bomb accelerated japan to surrender. Otherwise, japan would have surrender in early 1946.
This is full justification for the use of the A-bomb. The sooner ww2 ended, the better.