Hiroshima and Nagasaki in perspective
That, of course, is their right. They are surely kind, gentle souls who believe there is no such thing as evil and that every criminal is really a choirboy who was mistreated or molested or something. No doubt they would never own a gun, and if they're elected to office they would never have personal bodyguards, since they feel safe being the wonderful people they are.
Problem is, these people use the atomic bomb fact as a springboard to "prove" that the U.S. is really a terrible nation, or the government was/is terrible (at least "is" if a Republican is president). And unfortunately, young, impressionable minds lack any sort of context to defeat this notion.
So...if you want to get some perspective, something you can call on to set your kid straight if he or she asks why we did such a horrible thing, click on this link. It's a masterful recounting.