Building on a model first proposed by Gary Johnson, it is hypothesized that religious institutions demanding celibacy and other forms of altruism from members take advantage of human predispositions to favor genetic relatives in order to maintain and reinforce these desired behaviors in non-kin settings. This is accomplished through the institutionalization of practices to manipulate cues through which such relatives are regularly identified. These cues are association, phenotypic similarity, and the use of kin terms. In addition, the age of recruits and their contact with actual kin are factors that relate to kinship recognition and that are similarly manipulated by institutions in order to reinforce altruistic behavior directed toward non-kin. Support for this set of predictions is presented from historical and ethnographic sources on monastic life in Buddhism, Christianity, and Hinduism, as well as Islamic dervish groups, the Essenes, Shakers, and others. Potential implications of the model for understanding the development of religious institutions are preliminarily explored by reviewing Joachim Wach's model of religious developmental stages as well as some of the literature on the relationship between individualism and communalism in incipient religious organizations, in light of the kin-cue manipulation model.

In recent years, much has been learned about the strategic and organizational contexts of suicide attacks. However, motivations of the agents who commit them remain difficult to explain. In part this is because standard models of social learning as well as Durkheimian notions of sacrificial behavior are inadequate in the face of the actions of human bombers. In addition, the importance of organizational structures and practices in reinforcing commitment on the part of suicide recruits is an under-explored factor in many analyses. This essay examines the potential applicability of evolutionary models of altruism to the understanding of commitment to suicide on the part of terrorist organizational recruits. Three evolutionary models of sacrificial behavior in nonhuman species and many categories of human behavior are explored cross-organizationally: reciprocity, inclusive fitness theory, and induced altruism. Reciprocal altruism is unlikely to be a major motivator in suicide attacks because the costs exhibited by attackers are too high to be adequately compensated. However, the role of evolved self-deception in perceptions of personal death, and thus of rewards in the afterlife, is potentially illuminating. Inclusive fitness theory can help explain the motivations of attackers because rewards to kin often are offered by organizations to suicide recruits. However, suicide bombers also often act out of revenge for the loss of or injury to relatives, and inclusive fitness theory generally, as well as more specific theoretical models of retaliatory aggression, may not adequately account for the bombers' actions. Predictions from induced altruism theory appear to be well supported because suicide terror organizations tend to be tightly structured around practices intended to maintain and reinforce commitment though the manipulation of kinship-recognition cues.

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Human altruism in non-kin, unreciprocated contexts is difficult to understand in evolutionary terms. However, neo-Darwinian theories remain a potentially useful means of illuminating this behavior. In particular, induced altruism, wherein cues of genetic relatedness are manipulated to elicit costly behaviors for the benefit of non-kin, appears highly relevant. This article reviews cross-cultural data on several examples of extremely costly altruism—vows of celibacy, suicide bombings, and combat suicide—as exhibited in organizational and institutional contexts. Two predictions are used to test the relevance of induced altruism to the reinforcement of altruistic commitment to these behaviors. First, different organizations requiring costly sacrifice by their members should employ similar practices involving patterns of association, phenotypic similarity, and kinship terminology that are associated with kin cue-manipulation. Second, these organizational practices should be adopted as a consequence of recruit pools growing increasingly larger and, thus, less genetically related. There appears to be support for both predictions, suggesting that cross-cultural analyses could provide an effective avenue through which to test this and other evolutionary theories related to human unreciprocated altruism in non-kin contexts.

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