Shankar Vedantam considers what happens when people empathize with their enemy and considers why reaching out to another tribe can make ingroup members so angry. Vedantam interviews Avner Gvaryahu, a former paratrooper in the Israeli army, who angered his fellow Israelis for talking about his work as a soldier. He also interviews Mohammed Dajani, a Palestinian professor who now lives in the United States out of fear for his life. His crime? He led a group of Palestinian students to Auschwitz to try to help them understand the Holocaust.