What is the author's tone in Confederates in the Attic: Dispatches from the Unfinished Civil War by Tony Horwitz?

Horwitz's "campaign" is partly a personal journey and while he does not always maintain an objective viewpoint, he remains mostly respectful of the people he interviews. Even when he is confronted with prejudicial views he does not agree with, he presents his subject's opinions on their own, usually sparing comment. Horwitz's respectful tone sometimes cracks, however, and he actually confronts people. When talking to Walt, the white supremacist who believes Jews are behind a conspiracy to ruin America, Horwitz cannot resist telling Walt that he himself is a Jew. Later, when interviewing the outspoken Alabama teacher Rose Sanders, he disagrees sharply with her characterization of whites and Jews and he describes the argument that ensues.