In one of the diplomatic cables released by WikiLeaks Putin and Medvedev are compared to Batman and Robin. It’s a useful analogy: isn’t Julian Assange, WikiLeaks’s organiser, a real-life counterpart to the Joker in Christopher Nolan’s The Dark Knight? In the film, the district attorney, Harvey Dent, an obsessive vigilante who is corrupted and himself commits murders, is killed by Batman. Batman an