“Group identification can powerfully reinforce these conformity effects. In experiments similar to Asch’s landmark study, subjects have been found to conform much more when presented with judgments said to come from members of an in-group, and much less when judgments are said to come from out-group members. And it’s not just that people tend to think what their fellow tribe members think. They will do what their fellow tribe members do – even to the point of savagery.”