When I met Raúl Mijango, in a courtroom in San Salvador, he was in shackles, awaiting trial. He was paunchier than in the photos I’d seen of him, bloated from diabetes, and his previously salt-and-pepper goatee had turned fully white. The masked guard who was escorting him stood nearby, and national news cameras filmed us from afar. Despite facing the possibility of a long prison sentence, Mijango seemed relaxed, smiling easily as we spoke. “Bolívar, Fidel, Gandhi, and Mandela have also passed through this school,” he told me, “and I hope that some of what they learned during their…