In The Righteous Mind, Haidt invokes Michael Tomasello’s notion of “joint intentionality,” calling it our evolutionary Rubicon; i.e., the critical trait the evolution of which made us irrevocably human and led inevitably to the development of a large number of our most distinctive human characteristics, especially our groupishness. Haidt writes:
When everyone in a group began to share a common understanding of how things were supposed to be done, and then felt a flash of negativity when any individual violated these expectations, the first moral matrix was born… That, I believe, was our Rubicon crossing. (239)
I think Haidt gets a little too carried away over joint intentionality. The purpose of this post is to explain why and to suggest a more sensible alternative proposed by anthropologist Joseph Henrich.