Wars occur because it is human nature to act in one's own self-interest. Conflict or war typically happens because of anarchy. An example can be given at the international level, where there is no single leader or central authority which would suppress the political or military ambitions of individual states.
A civil war is usually fought within a State to impose throughout the state or of a part of its monopoly of violence, instead of that of their opponents; the State in question will be one of the contenders, if not collapsed. War crimes can be described as serious violations of ...