"Porter is also a skilled orator and while one should definitely read Blunder, a succinct summary of its main arguments can be taken in via video, in this informal presentation to the Oxford University Press staff. One of the points that comes through in that discussion is something that isn’t clear in his book: Porter was once a believer, if not an advocate, of some of the ideas he interrogates in Blunder. Though empirically it makes no difference to the text, having that foreknowledge does cast a different hue on his work. Lapsed disciples often make the keenest critics."