Tribe: On Homecoming and Belonging

by Sebastian Junger

In his survey of ancestral-type societies, Boehm found that—in addition to murder and theft—one of the most commonly punished infractions was “failure to share.” Freeloading on the hard work of others and bullying were also high up on the list. Punishments included public ridicule, shunning, and, finally, “assassination of the culprit by the entire group.” A cave painting from the early Holocene in Spain shows ten figures with bows in their hands and a lone figure prone on the ground with what appear to be ten arrows sticking out of him. The configuration strongly suggests an execution rather than death in combat. Boehm points out that among current-day foraging groups, group execution is one of the most common ways of punishing males who try to claim a disproportionate amount of the group’s resources. Boehm’s research has led him to believe that much of the evolutionary basis for moral behavior stems from group pressure. Not only are bad actions punished, but good actions are rewarded. When a person does something for another person—a prosocial act, as it’s called—they are rewarded not only by group approval but also by an increase of dopamine and other pleasurable hormones in their blood. Group cooperation triggers higher levels of oxytocin, for example, which promotes everything from breast-feeding in women to higher levels of trust and group bonding in men. Both reactions impart a powerful sensation of well-being. Oxytocin creates a feedback loop of good-feeling and gr...