World War 2, which was launched primarily by acts of aggression on the part of Germany, Japan, and the USSR, resulted in the deaths of 70-85 million people or about 3% of the world population. Of that total, only about 0.25% were killed by nuclear weapons. The other 99.8% were killed though conventional means.War is essentially an evil thing. Its consequences are not confined to the belligerent states alone, but affect the whole world. To initiate a war of aggression, therefore, is not only an international crime; it is the supreme international crime differing only from other war crimes in that it contains within itself the accumulated evil of the whole
More recently, the Iraq War launched by George W Bush in 2003 killed between 300,000 and 600,000 Iraqis depending on how expansively you count. Or up to 3-times more than Hiroshima and Nagasaki.
What is really important here? The method of the killing or the fact that nations choose to go to war?
Note: I am not excusing nuclear weapons here. Not at all. I'm just pointing out that they really aren't the real issue when it comes to decisions about war and peace.