“Does Altruism Exist?” by David Sloan Wilson

Wilson is a professor of biology and anthropology, who specializes in evolution, both genetic and cultural. His theory can be summed up as, “selfishness beats altruism within groups. Altruistic groups beat selfish groups.” The key tension is between intra-group selection and inter-group selection. There is a constant friction between the individual and the larger group. “Behaving for the good of the group typically does not maximize relative fitness within the group.” And for evolution everything is relative. “Natural selection is based on relative fitness. It doesn’t matter how well an organism survives and reproduces, only that it does so better than other organisms in the evolving population.” And humans have evolved to a degree that has not been reached by any other animal on the planet, not even fellow primates. Therefore, for humans the group has often become the unit of selection. “We crossed the threshold from groups of organisms to groups as organisms…. The kind of social control that suppresses destructive within-group competition but permits and often cultivates group-beneficial forms of within-group competition is part of what the concept of major evolutionary transitions is all about.”

Humans adapted a whole suite of behaviors from cooperation between genetically unrelated individuals, distinctive cognition, symbolic thoughts, including language, and the ability to transmit and pass on culture in a relatively short amount of time, evolutionarily speaking. This inter-generational learning through cultural evolution is what has separated humanity from other primates. It has allowed humans, as a species, to build on past knowledge, so that the whole has retained more knowledge than is possible for any one individual over the course of one lifetime. “Regardless of whether a phenotypic trait is genetically inherited, learned, or culturally derived, it can spread by virtue of benefitting individuals compared to other individuals in the same group, by benefitting all individuals in a group compared to other groups, and so on for a multilevel hierarchy of groups.” The important aspect of altruism, particularly, is that it is the actions of individuals that matter and not their thought processes. Altruism is defined as traits that help at the group level rather than the individual, regardless of motive. “Proximate mechanisms need not resemble functional consequences in any way whatever.” As inter-group selection has evolved to dominate intra-group competition in humans, altruism has become a mechanism that leads to selection that favors groups that have been selfless in action, regardless of the reasoning behind it.