"Somehow, a set of deeply conservative assumptions about children -- what they're like and how they should be raised -- have congealed into the conventional wisdom in our society. Parents are accused of being both permissive and overprotective, unwilling to set limits and afraid to let their kids fail. Young people, meanwhile, are routinely described as entitled and narcissistic. . . among other unflattering adjectives. In The Myth of the Spoiled...