What is the author's tone in the nonfiction book, Toms River?

According to Dan Fagin's biography on his web site, he is an environmental reporter. This explains his relatively passive tone throughout the book. Most of the times, he lets the facts condemn those he deems are guilty. He has the reporter's habit of stating facts and allowing the reader to build the case in her head. He attempts neutrality, and he says in his afterward that his goal was to state the facts. However, he lets his personal opinion seep in frequently. After all, why write a long book about this case if he did not agree that the pollution caused the illnesses?