EVEN by the standards of one of the world’s great conspiracy theorists, it was wacky stuff. On hearing the news that Argentina’s Cristina Fernández had become the fifth left-of-centre Latin American leader to be diagnosed with cancer in the past three years, Venezuela’s Hugo Chávez, himself unlucky enough to be one of them, mused that the United States might have developed technology to “induce cancer� in its political foes. “I don’t want to make any reckless accusation,� Mr Chávez said disingenuously, “but it’s very, very, very strange.�This could be just another piece of self-evident nonsense from Mr Chávez. After all, several of the other stricken leaders have friendly relations with the United States and the health scares have thus far increased the popularity of both Mr Chávez and Ms Fernández: Latin American politics has featured a maudlin streak ever since the early death (yes, from cancer) of Eva Perón. But Mr Chávez may have been putting up a smokescreen. The recent cancer cases offer not just stories of personal suffering but also a striking contrast in the way that the leaders affected have handled the...