In retrospect, what do you think about America dropping atomic bombs on Japan to end WWII on the Japanese front?

I don’t know what America teaches now, but when I was in school we were taught that it was a necessary evil. That much fewer people died in the end than if the war had continued. I was told that America warned Japan and gave them a chance to stop, but they chose to continue and so we carried through our threat. Nuclear weapons horrify me. The radioactivity I find extremely upsetting, let alone the damage just from the explosion. I don’t know what I think about ending a war by using devasting bombs. I tend to want to believe anything can be negotiated, but I know that is not true in real life.

Do you think America did the right thing? Do you think Japan did the right thing? Do you think that having a strong military and strong defense, is the best offense? If someone started dropping bombs on your country would you want to fight back?