Sebastian Junger

Crèvecoeur seemed to have understood that the intensely communal nature of an Indian tribe held an appeal that the material benefits of Western civilization couldn’t necessarily compete with.

A person living in a modern city or a suburb can, for the first time in history, go through an entire day—or an entire life—mostly encountering complete strangers. They can be surrounded by others and yet feel deeply, dangerously alone.

The evidence that this is hard on us is overwhelming. Although happiness is notoriously subjective and difficult to measure, mental illness is not. Numerous cross-cultural studies have shown that modern society—despite its nearly miraculous advances in medicine, science, and technology—is afflicted with some of the highest rates of depression, schizophrenia, poor health, anxiety, and chronic loneliness in human history. As affluence and urbanization rise in a society, rates of depression and suicide tend to go up rather than down. Rather than buffering people from clinical depression, increased wealth in a society seems to foster it.

The findings are in keeping with something called self-determination theory, which holds that human beings need three basic things in order to be content: they need to feel competent at what they do; they need to feel authentic in their lives; and they need to feel connected to others. These values are considered “intrinsic” to human happiness and far outweigh “extrinsic” values such as beauty, money, and status.

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.

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 group loyalty that ultimately leads members to “self-sacrifice to promote group welfare,” in the words of one study.

The positive effects of war on mental health were first noticed by the great sociologist Emile Durkheim, who found that when European countries went to war, suicide rates dropped. Psychiatric wards in Paris were strangely empty during both world wars, and that remained true even as the German army rolled into the city in 1940.

American analysts based in England monitored the effects of the bombing to see if any cracks began to appear in the German resolve, and to their surprise found exactly the opposite: the more the Allies bombed, the more defiant the German population became. Industrial production actually rose in Germany during the war. And the cities with the highest morale were the ones—like Dresden—that were bombed the hardest. According to German psychologists who compared notes with their American counterparts after the war, it was the untouched cities where civilian morale suffered the most.