It’s not difficult to tell whether the official tourist organizations in El Paso consider Lincoln Park a plus or a minus. It doesn’t appear in any of their brochures or promos and only rarely does any city official venture there—usually on one of the four celebrations held there each year. But in the shade beneath the freeway far overhead, the pylons supporting I-10 and US-54 are covered in Chicano art. Some celebrate cultural connections to ancient Aztecs, others promote classic cars. A few are memorials and some are cloaked in…