Neither author is an authority in any of the subjects addressed in the book, and they admit that it is a vanity project. In some cases, the lack of research into brain chemistry/neuroscience and behavioral psychology is obvious and leads authors to draw spurious conclusions or to miss obvious explanations. They clearly had a point of view and set out to justify it, and they generally seem to have a pessimistic and even disdainful perspective on numerous human institutions that distracts from the occasional interesting insight or example provided. The narrator read the book like he had a chip on his shoulder and was deigning to provide this information to the rest of us under protest. Perhaps a different tone or a different narrator would have improved this audiobook, but there just wasn’t enough substance or anything really insightful to justify the length of this book, IMO.