The Collaborators, the dark, engrossing, and occasionally brilliant new book by the Dutch writer Ian Buruma is not about collaboration—at least not in the way it’s implied in the book’s subtitle. Not really. To be sure, a good portion of its narrative unfolds in countries or territories under foreign occupation during the Second World War (or its Asian preamble), societies reset where new rules had, as well as new rulers, replaced the old, creating undeserved opportunities for, or forcing unwanted choices on, those who lived in them. Buruma draws up a taxonomy of the types of collaborator and touches on the reasons they behaved in the way they did. Some were on the make, others were ideologues, still others told themselves they were the lesser evil, and the list goes on….