It would be easy to dismiss the controversy over the latest Martin Amis offering as little more than a salon tiff among self-referential literati. His book, Koba the Dread, follows a well-trodden political path. An excoriation of Lenin, Stalin and communism in general (interlaced with long-simmering spats with his once communist father Kingsley and radical friend Christopher Hitchens), it is intended to be a savage indictment of the left for its supposed inability to acknowledge the crimes committed in its…