One could argue that those skills actually prevent far worse unethical actions. Without Hiroshima, how might World War II have ended? How would the Chinese and Koreans feel if Japan weren't defeated? Spend a few minutes at the Nanking museum or perhaps read about Bataan or Korean comfort women and then the moral high ground gets a bit slippery. One might, if one were so inclined, make an argument that nuclear weapons prevented World War III due to the mutually assured destruction concept. The Cold War would have become very hot if the politicians of both the Soviet Union and the U.S. didn't have to fear for their own annihilation.

War and politics is dirty and not as academic as many people would like to think. It never is black and white. For example, if we take the moral high ground, our enemies won't. Pacifism sounds good until it's your sister getting raped in your living room or your parents being shot out of the sky.