My premise assumes that at least one adversary will develop these weapons whether we do or not. Your premise assumes that everyone would agree not to do it, an

My premise assumes that at least one adversary will develop these weapons whether we do or not. Your premise assumes that everyone would agree not to do it, and also keep that agreement. This is basic game theory. Your position is indefensible. It's not about monsters, or morals. It's just math.