If nuclear weapons didn't affect the entire world, I'd say we may have been justified in dropped atomic bombs on Nagasaki and Hiroshima. However, the impact of nuclear weapons on the entire world (the release of radioactive particles into the atmosphere) was not worth ending the war quickly.
"No, Mama. You can bet your sweet ass and half a titty whoever put that hit on you already got the cops in their back pocket." ~Black Dynamite