There must be offsetting factors or humankind would still be a bunch of hunting parties living in caves.
E.g., what's up with Scandinavians? Just over a millennium ago, they were the avatars of terrorism; as the Anglo-Saxon prayer went, "May God protect us from the fury of the Northmen!" Today, "Scandinavian" is synonymous with the rule of sweet reason and the welfare state. There is a continuing commitment to group interests throughout this saga, but the definition of group interest has evolved in this instance beyond the selfish combativeness extolled by conservatives.
Carl