Ethics of Weapon Development

I believe it is moral for societies to develop weapons of mass destruction. While it is a terrible thing to have to go to war, on many occasions it is necessary. If people had not been willing to fight the Germans in World War II, the Jewish, gypsies, homosexuals, along with other persecuted groups, would have continued to be killed in death and concentration camps; we might also ALL be Germans by now if Adolf Hitler had not been stopped. If the American colonists had not revolted against Britain, we might still be an English colony. Countries need to be able to build what weapons they deem necessary to protect themselves and their allies. It would be a very horrible thing if the United States was attacked and we did not have adequate weaponry to protect ourselves because someone dubbed it 'unethical.' While violence is never a good thing, on certain occasions it is a necessary evil; great weapons are often needed in order to prevent an even greater horror.