What are the motifs in Chain of Command: The Road from 9/11 to Abu Ghraib by Seymour Hersh?

Political orthodoxy is a recurring idea. Individuals and groups working in the government generally have political views in which they strongly believe. These views (conservative, liberal, hawkish, progressive, etc.) occasionally are so strong as to make these individuals blind to other points of view, even when they make more sense. Like-minded groups of people tend to cluster together, sometimes resulting in a group with little difference in opinion and therefore difficulty in objectively analyzing information.