Why do even rational people get embroiled in conflicts they can't solve? The root cause, says Daniel Shapiro, founder and director of the Harvard International Negotiation Program, is an adversarial mindset called the Tribes Effect, in which conflicts turn into "me versus you, us versus them."
"People think, 'Let's just be rational and we can resolve our differences, we can resolve our conflict,'" Shapiro says. "Not true. Unless you deal with the core psychology to the conflict, the mindset that's driving you and the other side in the conflict, unless you deal with that, the conflict will persist."