It's not cut and dried. It's a tricky situation because of the nature of Asian cultures, and especially the Japanese one. If the leaders told the people to keep fighting, then in the event of a land invasion, they would have taken tremendous losses in addition to heavy losses on the aprt of the invaders.
Truman was not a vindictive man and there's no evidence that the U.S. did this as "payback" for Pearl Harbor.
The quick surrender after the bombings also prevented the deaths of many civilians that the Japanese were keeping in work camps. The way that the Japanese behaved during the war was probably more inhuman than any other nation. They were convinced that they were the true master race and had no compassion for even their fellow Asians.
Even after the bombings, the Emperor was nearly overthrown multiple times when he attempted to surrender. The leaders were heavily divided over whether a surrender was acceptable at all even though they had clearly lost the war even before the bombings.
The very fact that this is still debated by historians decades later shows that we simply cannot say whether it was necessary and whether it was moral. There's too many variables.
Simon: Some of what you're asserting is unproven conspiracy theory. I could tag half of your posts' content with "[citation needed]"s.