They already knew the effect of an atomic bomb, as they had tested it in July of 1945. The allies knew the effect, that is why they used it.
If there had been no reason to drop an atomic bomb, do you think a reason would of been created anyway to see its affect?
Yes.
Yep. The quest for power is in our nature. Our culture was built on conflict, the victors gain the spoils, control the people and write the history.
They climbed mount Everest,
because it was there. Every article
of human endever must be realized.
