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War may be a natural expression of biological instincts and drives toward aggression in the human species. Natural impulses of anger, hostility, and territorialityare expressed through acts of violence. These are all qualities that humans share with animals. Aggression is a kind of innatesurvival mechanism, an instinct for self-preservation, that allows animals to defend themselves from threats to their existence. But, on the other hand, human violence shows evidence of being a learned behavior. In the case of human aggression, violence cannot be simply reduced to an instinct. The many expressions of human violence are always conditioned by social conventions that give shape to aggressive behavior. In human societies violence has a social function: It is a strategy for creating or destroying forms of social order. Religious traditions have taken a leading role in directing the powers of violence. We will look at the ritual and ethicalpatterns within which human violence has been directed. The violence within a society is controlled through institutions of law. The more developed a legal system becomes, the more society takes responsibility for the discovery , control, and punishment of violent acts. In most tribal societies the only means to deal with an act of violence is revenge. Each family group may have the responsibility for personally carrying out judgment and punishment upon the person who committed the offense. But in legal systems, the responsibility for revenge becomes depersonalized and diffused. The society assumes the responsibility for protecting individuals from violence. In cases where they cannot be protected, the society is responsible for imposing punishment. In a state controlled legal system, individuals are removed from the cycle of revenge motivated by acts of violence, and the state assumes responsibility for their protection. | 
