Answer:
Are political systems related to collective violence and war? This is now fundamentally answered in one of three ways: yes, democracies are least violence prone; yes, socialist equalitarianism assures peace; and no, political systems and violence are unrelated.
Recent theoretical and empirical research confirms the first answer: those political systems that maximize and guarantee individual freedom (democracies) are least violence prone; those that maximize the subordination of all individual behavior to state control (totalitarian systems) the most, whether socialist or not; and wars do not occur between democracies.
Known for centuries, a tenet of classical liberalism, the pacific nature of democracy has became largely forgotten or ignored in the last half-century. That democracy is inherently peaceful is now probably believed by no more than a few prominent peace researchers. In part this has been due to the intellectual defection of Western intellectuals from classical liberalism to some variant of socialism, with its emphasis on the competitive violence and bellicosity of capitalist freedoms. Many intellectuals, and in particularly European and Third World peace researchers, have come to believe that socialist equalitarianism is the answer to violence; others, particularly American liberals, believe that if the socialist are wrong, then at least democracies are no better than other political systems in promoting peace.
Socialism aside, there also has been a rejection of Western values, of which individual freedom is prominent, and acceptance of some form of value-relativism (thus, no political system is better than any other). In some cases this rejection has turned to outright hostility and particularly anti-Americanism, and thus opposition to American values, such as freedom. To accept, therefore, that democratic freedom is inherently most peaceful, is to the value-relativist, to say the unacceptable--that it is better. For another, to accept that this freedom promotes non-violence seems to take sides in what is perceived as the global ideological struggle or power game between the United States and Soviet Union.
Independent of different ideological or philosophical perspectives, several interacting methodological errors have blinded intellectuals and peace researchers to the peacefulness of democracies. One of these is the strong, general tendency to see only national characteristics and overall behavior. Then a nation is rich or poor, powerful or weak, belligerent or pacific. But most important for identifying the relationship between freedom and violence is rather the similarities and differences between two states and their mutual behavior. Thus should be observed a lack of violence and war between democracies; and the most severe violence occurring between those nations with the least freedom.
Another error has been to selectively focus upon the major powers, which include among them not only several democracies having many wars, but also Great Britain having the most. However, a systematic comparison among all the belligerents and neutrals in wars, would uncover the greater peacefulness of democracies.
Along with this selective attention is the tendency to count equally against democracies all of its wars, no matter how mild or small. Thus, the American invasion of Grenada would be one mark against democracy; Hitler's invasion of Poland that initiated World War II would be a similar mark against non-democracies. This stacks any such accounting against democracy.
Finally, while a systematic survey of the literature shows significant support for the inverse relationship between democracy and violence, researchers have done little theoretical testing of this relationship, thus resulting in their overlooking or ignoring it when it appears in their results.
Step-by-step explanation: