It should raise questions when an enormous, complicated realm of life takes on the characteristics of a stock drama. In the current school-reform story, there is a reliable villain, in the form of the teachers' unions, and a familiar set of heroes, including Geoffrey Canada, of Harlem Children's Zone; Wendy Kopp, of Teach for America, the Knowledge Is Power Program; and Michele Rhee, the superintendent of schools in Washington, D.C. And there is a clear answer to the problem-charter schools.