The Arizona-Mexico border and the pathways to northern cities and farm fields have always been dangerous places. Just ask the granddaughter of a Cochise County rancher. The 13-year-old was surprised on a hike by armed immigrant smugglers who were bringing their human cargo across her grandfather's ranch and through the desert. She still has terrible nightmares of these men with guns. Or the 13-year-old immigrant girl named Montserrat who was making a trek to find work. Montserrat told the New York Times she thought she would go to school and eventually get a good job in the United States. Instead...