Within hours of the killing of Mexican drug lord Nemesio Oseguera, better known as El Mencho, in a military raid on Sunday, gunmen suspected to be his supporters blocked highways across several states and set cars and businesses ablaze. In some towns, tourists and residents were urged to stay indoors, while truckers were advised to take safe routes or return to their depots until the violence abated. Several airlines, including Air Canada, United Airlines and Aeromexico, on Sunday cancelled flights to Puerto Vallarta, a beachside resort town where stunned tourists filmed plumes of smoke rising into the sky from fires. The burst of violence across more than half a dozen states painted a familiar scene for Mexicans who have spent two decades watching successive governments wage war on drug cartels, ravaging broad swaths of the country. A member of Oseguera’s Jalisco New Generation Cartel told Reuters that the blazes and sporadic gunfire were carried out in revenge for the government’s killing of Oseguera, and w...