'I wish somebody else could be boss of the people' B Y M E L I N D A R U L E Y Children, I've noticed, are powerfully drawn to tribes, groups of others who are, if not like-minded, fitted out at least with the same colors, slogans, face paint, piercings, war whoops. The first tribe is the family, the "us" into which each child is born, but kids are quick to diversify, declare allegiances to other "us"es--teams, clubs, gangs, fraternities--that may or may not reflect the values of their tribe of origin. I've no idea why, six thousand...