The Controversial Origin of War and Peace: Apes, Foragers, and Human Evolution

I came across this article, by Luke Glowacki, in 3 Quarks Daily. It is an unusually academic article for them to post, but I read it with interest, because war has been so much in the headlines recently. Unfortunately, the article is extremely narrow in scope and focuses mainly on the timeline in the history of war. The questions become "Did war originate with our common ancestor with chimpanzees and bonobos or later?" and "If it originated much later, was it present among Homo sapiens hunter-gatherers?" I think that the article could have been improved by spending more time defining the role of war and aggressive behavior within a species.

Chimpanzees are known to behave aggressively toward other chimpanzee groups. Bonobos are not as well understood, but they don't seem to be as aggressive as chimpanzees. Glowacki fails to mention that bonobos operate in matriarchal hierarchies, and I think that gender could be a useful lens for discussing war, since female primates are generally less physically violent than male primates, and are accordingly smaller and weaker. Although there is evidence that human hunter-gatherers engaged in warlike behavior, it is somewhat unclear how that manifested itself prior to the development of agriculture about 10,000 years ago. Glowacki does at least mention that, as a practical matter, it would be difficult for early hunter-gatherers to organize and coordinate anything that would resemble a modern army. He finishes by saying:

Recognizing that the capacity for both war and peace may be an outcome of our evolutionary history better explains how our species today can create durable peaceful relationships among societies that encompass billions of individuals but at the same time petty grievances and disputes can precipitate war with little provocation. We carry their evolutionary legacy today in our own struggles to create a more peaceful world, but one in which we all too often turn to violence.

I did not find this saccharine conclusion very enlightening.

My preferred way of looking at human behavior is through the lens of our evolutionary development of eusocial behavior, or, more broadly, cooperation. This occurred in tandem with bipedal gait and, later, the development of language. Through this process, Homo sapiens in effect outcompeted not only chimpanzees and bonobos, but all other hominids. Evolutionary processes permitted humans to achieve greater fitness than all other primate species. Rather than pretty this up for a feel-good moment, I prefer to compare humans to eusocial insects. I am reminded of my earlier post, "The Brutality of Life," in which I described honeybees:

Every spring, a fertilized queen sets out to start a nest. She finds a site, often a hole in the ground, and begins to lay eggs. The queen emits chemicals that cause all of the eggs to become females that do not reach maturity. The nest then becomes a factory where the queen continues to lay eggs and her daughters tend to the eggs, find food and defend the nest. Toward the end of summer, the queen stops emitting the chemicals that control the development of her eggs and offspring. Some of her daughters mature to adulthood, and some males are born. The daughters start to lay their own eggs. Initially, the queen attempts to eat all of the eggs laid by her daughters, but eventually, her mature daughters attack and kill her. The mature daughters that have been fertilized leave the nest seeking shelter for the winter. In the spring, the process starts again.

It seems to me that scientists often ignore the most basic principles of Darwinism. Natural selection is not a pretty process, and for the most part it's just a numbers game: did a species survive, and, if so, how? We like cooperation and social harmony, but that is only because we have evolved to feel that way. Most species don't, and that includes honeybees. While, ostensibly, honeybees are eusocial, like us, the queens exert complete biological control over all of the other members of their hive. Eusociality itself does not imply equality. The end result is that honeybees are an extremely durable species, while nearly all honeybees are, in effect, slaves. In his essay, "Brain Size and the Emergence of Modern Human Cognition," Ian Tattersall describes how modern humans evolved in a rather haphazard manner during periods of vacillating climate change. In an evolutionary sense, this means that we just happened to have the right characteristics at the right times, and we could easily have become extinct with slight environmental differences. As a cautionary note to optimists, I often feel compelled to point out that our notions of morality do not correspond with the universe in general and are simply evolutionary characteristics that have helped our species survive. On the other hand, on a more purely rational basis, there is ample reason to remove from office leaders whose aggressive military actions cause the pointless loss of human life and unnecessary humanitarian crises. The long list of offenders includes not just Adolf Hitler and Vladimir Putin, but Benjamin Netanyahu and George W. Bush.  

In my opinion, the major problems that we are facing now are human overpopulation and anthropogenic climate change. Those two conditions alone are generating pointless wars. Most countries, including the U.S., currently lack governments that seem capable of addressing those risks.