They are steadfast against the wall because over 70% of their illicit activity goes through there.  Trillions of dollars of illicit drugs, human trafficking, guns, gangs, etc.  Look at the sealed indictments maps==most of the indictments are along the southern boarder. If Trump puts up the wall they would have to reroute all the illicit activities.  Very, very hard to do. Major disruption in their business activities.