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Groups in Mind: The Coalitional Roots o[War and Morality

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War, Coalitions, and the HUnlan Condition War is older than the human species. It is found in every region of the world, among all the branches of humankind. It is found throughout human history, deeply and densely woven into its causal tapestry. It is found in all eras, and in earlier periods no less than later. There is no evidence of it having originated in one place, and spread by contact to others. War is reflected in the most fun-damental features of human social life. When indigenous histories are composed, their authors invariably view wars -unlike almost all other kinds of events -as preeminently worth recording. The foundational works of human literature -the Iliad, the Bhagavad-Gita, the Tanakh, the Quran, the Tale of the Heike -whether oral or written, sacred or secular -reflect societies in which war was a pervasive feature. War is found throughout prehistory (LeBlanc and Register 2003; LeBlanc 1999; Keeley 1996). Wherever in the archaeological record there is sufficient evidence to make a judgment, the traces of war are to be found. It is found across all forms of social organization -in bands, chiefdoms, and states. It was a regular part of hunter-gatherer life wherever population densities were not vanishingly low, and often even in harsh and marginal habitats. The existence of intergroup 191 conflict in chiIIlpanzees suggests that our ancestors have been prac-ticing war for at least 6 n1illion years, and that it was a selective pres-ence acting on the chimpanzee-horninid COn1ITlOn ancestors and their descendants (Manson and Wranghan1 1991; Wilson and Wranghanl 2003; BoehIIl 1992). The evidence indicates that aggressive conflict ainong our foraging ancestors was substantial enough to have con-stituted a nlajor selection pressure, especially on nules (Keeley 1996; Manson and Wranghain 1991). Careful ethnographic studies of liv-ing peoples support this view (Chagnon 1983; Heider 1970). Indeed, in some ethnographically investigated snull-scale societies where actual rates can be Ineasured, a third of the adult rIlales are reported to die violently (Keeley 1996), with rates going as high as 59 percent, reported for the Achuar (Bennett Ross 1984). Coalitions especially male coalitions -and intergroup rivalries are a cross-culturally univer-sal feature of hUlnan societies ranging iI-OlIl hunter-gatherer societies to complex, post-industrial societies. Expressions of coaiitionalisni include states, politics, war, racisnl, ethnic and religious conflict, civil war, castes, gang rivalries, rnale social clubs, con1petitive tealn sports, video gaInes, and war re-enactIIlent (Alexander 1987; Keegan 1994; Sidanius and Pratto 2001; Tiger 1969; Tooby and Cosnlides 1988; Tooby, CosIIlides, and Price 2006).
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... Natural selection wrote different rulebooks for siblings, parents and offspring, cooperative partners, and coalitional allies, to mention a few. Different cognitive systems evolved for navigating each of these relationships, including ones specialized for helping kin (5), trading goods and favors (1,(6)(7)(8), pooling risk in foraging (9)(10)(11), and cooperating in groups (3,12,13). Each cognitive system is equipped with different concepts and inferential mechanisms, which generate moral intuitions tailored to its domain. ...
... The war dilemma is also designed to test features of the MTS. Warfare is a domain that was relevant during human evolution (19,20) and activates multiple moral intuitions (3,13,(44)(45)(46). Minimizing loss of life in warfare is often seen as a moral good; so is sparing innocent lives. ...
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How does the mind make moral judgments when the only way to satisfy one moral value is to neglect another? Moral dilemmas posed a recurrent adaptive problem for ancestral hominins, whose cooperative social life created multiple responsibilities to others. For many dilemmas, striking a balance between two conflicting values (a compromise judgment) would have promoted fitness better than neglecting one value to fully satisfy the other (an extreme judgment). We propose that natural selection favored the evolution of a cognitive system designed for making trade-offs between conflicting moral values. Its nonconscious computations respond to dilemmas by constructing "rightness functions": temporary representations specific to the situation at hand. A rightness function represents, in compact form, an ordering of all the solutions that the mind can conceive of (whether feasible or not) in terms of moral rightness. An optimizing algorithm selects, among the feasible solutions, one with the highest level of rightness. The moral trade-off system hypothesis makes various novel predictions: People make compromise judgments, judgments respond to incentives, judgments respect the axioms of rational choice, and judgments respond coherently to morally relevant variables (such as willingness, fairness, and reciprocity). We successfully tested these predictions using a new trolley-like dilemma. This dilemma has two original features: It admits both extreme and compromise judgments, and it allows incentives-in this case, the human cost of saving lives-to be varied systematically. No other existing model predicts the experimental results, which contradict an influential dual-process model. moral psychology | evolutionary psychology | moral dilemmas | judgment and decision-making | moral value pluralism
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... What people deem ethically 'good' may, however, vary by group and culture (Sachdeva, Singh, & Medin, 2011). The moral standards of the group can be used to determine if an individual is fit to be part of the group or does not conduct himself or herself in accordance with the group's morals (Gert, 1988;Lind & Tyler, 1988;Tooby & Cosmides, 2010). ...
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