Was the use of the atomic bomb against Japan justified?

[VOX]

63. Battle of Okinawa 4/1/45-6/21/45: Estimated 150,000-250,000 total deaths

There was no way that the Japanese mainland was going to be invaded by Allied troops -- they closer they got to Japan, the harder the Japanese fought, and they gave no indication that they would ever surrender. Many Japanese civilians on Okinawa committed suicide, so great was their commitment.

Battle of Okinawa 4/1/45-6/21/45: estimated 150,000-250,000 total deaths
Allied casualties: 12,513 killed; 38,916 wounded
Japanese casualities:
95,000+ killed
Estimated 10,000 captured
Estimated 42,000–150,000 civilians killed

As horrible as the bomb was/is, the probable death toll resulting from an invasion of the Japanese mainland would have been staggering on all sides. The best available estimated data on total casualties from the two bombings:
Deaths -- Hiroshima: 66,000 / Nagasaki 39,000
Injured -- Hiroshima: 69,000 / Nagasaki: 25,000
Total Casualties -- Hiroshima: 135,000 / Nagasaki: 64,000

Tragically, the extremely grim outcome of the Battle of Okinawa enabled the horror of the A-Bomb to be unleashed.