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Wars are seen as the result of evolved psychological traits that are turned on by either being attacked or by a population perception of a bleak future. The theory accounts for the IRA going out of business, but leads to a dire view of current wars.[33] Studies of endemic violence and tribal warfare in the Highlands of Papua New Guinea demonstrate that intertribal warfare is highest in those parts of the country where population densities are greatest and pressure on land and other resources is thereby maximized. Similarly, evidence of organized warfare in the Ancient World, in pre-dynastic Mesopotamia and in Ancient Egypt, suggests that organized systematic warfare only appeared after population densities had increased, and there was increased pressure upon limited ecological resources.
(These ideas above are actually old International Relations ideas and are not based on Evolutionary Psychology at all, in fact they are not consistent with the Theory of Evolution and so cannot be Evolutionary Psychology theories. A central tenet of the Theory of Evolution is that populations quickly fill their ecological niches, creating selective pressure for the most fit. In effect, a "bleak future" is a given over evolutionary time, in fact this insight of Malthus's lead Darwin to the Theory of Evolution, and it is maladaptive to wait until you perceive it coming, when your attack will be anticipated. It is also maladaptive to not take the opportunity to gain habitat and women by attacking your neighbor when they are weak. When the bleak future arrives they may be strong or have new allies. Maladaptive behaviors cannot be selected for. So the ideas above do not mesh with the theory which is central to Evolutionary Psychology. Nor do they fit with the anthropological record which Evolutionary Psychology always seeks to corroborate its ideas with.)
The book "The Most Dangerous Animal: Human Nature and the Origins of War" by David Livingstone Smith is much more relevant for those seeking a view generated by the Evolutionary Psychology methodology.
The paper "Altruism and War" which can be found here is a work written for an academic audience which takes an Evolutionary Psychology viewpoint on war as well, attempting to describe for the first time the entire psychological process from commitment to group to willingness to kill members of another group on one's groups behalf.
A critical aspect of all true EP based theories of war is the understanding that most or all of the proximate causes of war are little more than excuses that our minds need to fabricate to justify their actions. These justifications take universal forms at every level of human group conflict. They can include: 1)The assertion that the other group presents a threat which must be defended against, 2)The assertion that the other group has provoked the conflict, 3)The assertion that the other group has committed acts which violate morality (such as stealing from your group, raping women, taking premature babies out of incubators), 4)Descriptions of the other group as being threat animals or pathogens (snakes, bears, jackals, cancers, rats, and so on), 5)Asserting that the other is inherently evil, 6)Asserting that the other group are insane or lead by the insane. The other inherent pattern is that positive group definitional attributes are seen as being the opposite of the enemy or rival group.
Evolutionary Psychology hypothesis on war also importantly show that the decision making process is rarely rational, that in fact human belief and decision making processes are often not rational on the whole.
Of course, one side sometimes is simply defending itself. But more often both sides go through a similar and linked psychological process of justification, as above, and an escalating cycle of verbal and then violent action. Such escalation takes place as an effect of our evolved program to punitively punish the other for their transgression through acts which attempt to dissuade them from further transgression, by going well beyond simple tit-for-tat.
Looking for rational causes, as is common in most hypothesis and even in the above mentioned notions of perceived bleak futures, is not the path to understanding war.
