This wasnt war for wars sake, except for Japan, and at first Dritte Reich (but diminished during 1944, as they were losing)
Either way, dropping it on 2 major cities, destroying so much, and what came after even worse...
Here's probably what you didn't know:
There are recordings, and interviews where pretty much everyone stated the same thing: What have we done
The thing is, noone knew what the extent of what was going to happen fully, while some might not have cared initially, they did after..
Those who survive the actual bomb die (probably) the most painful death unimaginable... Radiation poisoning
I have to ammend, the part where they/we didn't know is probably why it was used twice, and not once -
Yea, they probably would have used it. Read the materials, and as stated before, what they knew then and what we know now makes opinions in this thread void.
They made an invasion assessment that scaled much higher than what the lives the bombs eventually took were,
and considering those are the only two choices that would have ended the war, the stories in the books could be much worse
Japan could be many years behind what it is now (poor country), it could be taken the way Germany was, or free and much more hostile than it is now.