CABO SAN LUCAS, Baja California Sur, Oct. 21 — I board the Ruta del Desierto bus at 7:30 p.m. en route to the Autónoma stop. I’m not flush enough to stay anywhere closer to the city center. There’s a woman in an orange blouse singing cumbia, banda and boleros with her own microphone and personal boombox that has pre-recorded songs, though I stopped paying attention after her rendition of “La Llorona,” a traditional Mexican folk song perhaps best…