Willingness to lay down one’s life for a group of non-kin, well documented historically and ethnographically, represents an evolutionary puzzle. Building on research in social psychology, we develop a mathematical model showing how conditioning cooperation on previous shared experience can allow individually costly pro-group behavior to evolve. The model generates a series of predictions that we then test empirically in a range of special sample populations (including military veterans, college fraternity/sorority members, football fans, martial arts practitioners, and twins). Our empirical results show that sharing painful experiences produces “identity fusion” – a visceral sense of oneness – which in turn can motivate self-sacrifice, including willingness to fight and die for the group. Practically, our account of how shared dysphoric experiences produce identity fusion helps us better understand such pressing social issues as suicide terrorism, holy wars, sectarian violence, gang-related violence, and other forms of intergroup conflict.

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A robust literature on ingroup versus outgroup conflict suggests that perceived discrimination may be an important factor in intergroup aggression. Yet, to date, no studies have tested the hypothesis that the perception of being the victim of anti‐Muslim discrimination might be associated with support for anti‐Western political violence. We undertook an analysis of two Pew Global Attitudes Surveys: (1) a 2006 data set surveying 1,627 adult Muslim residents of Great Britain, France, Germany, and Spain and (2) a 2007 data surveying 1,050 adult Muslim residents of the United States. Our analyses support the conclusions that younger age and perceived discrimination are both associated with support of suicide bombing in these Muslim diaspora populations. Study 1 found that a bad experience of discrimination increased the odds of justifying suicide bombing among European Muslims by a factor of 3.4. Study 2 found that experienced discrimination was associated with justification of suicide bombing among American Muslims. If further investigations confirm that perceived discrimination is a risk factor for support for political violence, initiatives to reduce discrimination would theoretically reduce the risk of terrorism. We discuss the challenge of breaking the vicious cycle of intergroup prejudice and radicalization.