What is the author's tone in Savage Inequalities: Children in America's Schools by Jonathan Kozol?

Kozol seems to realize that the schools he is not the first person hoping to help students at inferior schools. In fact, he is only one in a long line of authors and social scientists and politicians arguing for change but failing to make change. For reasons he explains in the book, an emotional appeal to fairness is not helping matters. So instead, Kozol takes a patient, logical tone in building his argument step by step. He looks for reasons why others might challenges his ideas, examines the challenges then defeats them one by one. He builds up a mountain of evidence as he travels from city to city observing. The author builds trust with readers through this method and does not come across as an outraged or knee-jerk reformer.