Chemical weapons and biological weapons are banned even in formally declared wars so why not nuclear weapons? Are nuclear weapons more humane?
And yes, the fire bombing of Dresden, as was the bombing of Hiroshima and Nagasaki just indiscriminate extermination of civilians with no military value other than terror. I do recognize that the A Bomb did bring a quick end to the war in Japan and perhaps did save more lives than it took at least American lives.