You say the only alternative to nuclear war is world government. There is only one possibility worse than nuclear war for the survival of modern civilization, and that is world government. Civilization might recover from the damage of a nuclear war, but judging by past static empires in Egypt and China, it might never recover from world government, there being no chance of external intervention. As it is, present governments are only prevented from becoming dominated by crazy ideas that will suppress all opposition by the existence of other governments. The only way a people can be sure that their government is substandard is that it does worse than those of other countries.