@Khethil,
Knowing what we know now, the atomic bombs were probably NOT necessary to get the Japanese to capitulate, and in fact they probably weren't what caused the surrender in the end. The
most important reason why the Japanese surrendered was because the Soviets declared war on Japan on August 8, 1945, which was 2 days after Hiroshima and 1 day before Nagasaki.
A two-front war between the Americans and the Red Army was an unthinkable prospect for Japan, which they had known from the beginning. Japan had been
strongly in favor of the German war against the Soviets, because it drew their attention away from Japan's activities in Asia.
The Avalon Project : Soviet Declaration of War on Japan
That said, the atomic bombs
in combination with the Soviet declaration certainly hastened the surrender -- which would have been otherwise accomplished by a bloody invasion or a brutal siege.
But more importantly the atomic bombs were a message from the US to the Soviet Union. The Allies didn't trust the Soviets even
before the war, and it only got worse as they encroached on Berlin. The Cold War was already in effect
during the war in Europe, and the bombing of Japan was a major "diplomatic" statement.
Whether it was "right" or not? I'm not sure complicated strategic acts like this can be so simply categorized. But I have less problem with the atomic bombs than I do with the firebombing and virtual incineration of Tokyo, to say nothing of Dresden, Munich, etc. Of course when we compare this to Japan's and Germany's atrocities, it certainly suggests to me that hastening the end of this war by whatever means was probably acceptable.
PaulG wrote:however, Germany finally succumbed to the allied forces.
The thing is, though, even though Germany didn't surrender until May 8, 1945, they NEVER had a chance of winning the war once they invaded the Soviet Union in 1941, especially once they collapsed in front of Moscow and nonsensically declared war on the US at the same time. After the Battles of Stalingrad and Kursk, by the spring of 1943 Germany didn't launch a single significant offensive for the rest of the war -- they were retreating continually for 2 years. They were prepared only for blitzkrieg -- they never had the army, industry, strategy, economy, or military leadership to sustain a protracted total war against the Red Army. Even if D-day had failed Germany would have
still lost -- because by June 1944 the Soviets were already near the border with Poland, Belarus, and Ukraine.