Why Monkey Groupthink Beats Human Logic

The urge to belong to a group and avoid its sanctions is potentially stronger than the individual instinct for survival or procreation. Tribalism is animating politics and culture, often to the detriment of both. Where does it come from, and why is it more vivid now than twenty years ago?

David McRaney is host of the "Your Are Not So Smart" podcast, and joins to discuss how our monkey brains are more wired to promote group cohesion than to think critically or logically--and what to do about it.