The minibus was headed through the Canapé-Vert neighborhood of Haiti’s capital early Monday morning when it came to a police checkpoint. When officers saw that the minibus was packed with young men they suspected of being gang members, they stopped it and made everyone get off and lie on the ground. Soon, residents of the neighborhood appeared, dragged the men away from police custody and beat and stoned them. Then they threw gasoline-soaked tires on top of them — all under the eyes of the police — setting fire to more than a dozen people, some of them still alive. “Pour gasoline, pour gasolin...