To believe, in the 1980s, that Ronald Reagan was going to blow up the world may have been merely peculiar. To believe so today is a symptom of raging Reagan Derangement Syndrome. And yet here we are, with The Reagan Show, a new documentary rehashing the paranoid style of Reaganography, set for limited theatrical release on June 30 and video-on-demand release shortly thereafter. The continuing popularity of President Reagan is a source of profound irritation and unease to liberals. To assuage their pain, they have gone back to their initial rationalization for how Reagan became so beloved: He cheated. Though...