Hiroshima (1946)
When I was young in grade school, and learned about the bomb, and its terrifying aftermath, pictures, scars, I thought that this was clearly a wrong against humanity to have been dropped on anyone.   Clearly the visceral kind of "this should never happen" reaction that any average person would have.  "How could we put the Enola Gay on a stamp to glorify this?"Then, in college and especially after, learning about the equal horrors of the Japanese war machine, and maybe actually more the non-horrific but relentless robotic support for the war (or obedience towards the emperor, government, etc) among the people, I realized that it actually did bring an end to the war.  Which if it had continued, could have consumed far more lives.  (whether it had to be this tool, of course, is certainly worthy of debate)Now, my 3rd phase of thinking -- beyond any opinion on tactics or reaction or bombs in the moment of a war -- is how do we get people to help themselves get out of the path to war?  Each and every one of us, who whether by support or indifference, or tacit approval, or compounded misinformation, or ego, get ourselves into situations that we look back 50 years from now and say, "what happened?".Surely, we have the tools and desire, don't we?  I hope.