Jonathan Haidt’s talk examines the political divide and ways to heal it from The Righteous Mind. His discussion of the problems free riders pose is often discussed here in terms of vaccinations. Haidt discusses group adaptations posited by Darwin and central to Edward O. Wilson’s 2012 The Social Conquest of Earth. Chicagoboyz might also find interesting his TED presentation “Religion, Evolution, and the Ecstasy of Self-Transcendence.” He concludes with Donne, a man of deep passions both religious and secular, whose meditation “No man is an island” was a favorite of my father, repeated often as I grew up, integral to our fly-over village. But, of course, it is always and everywhere, our experience.
Another TED discussion summarizes the Liberal/Conservative split section of the longer (and aimed at a different audience) talk. (Haidt knows his pedagogy – interesting, visual, reinforcing.)