Ahh, C’mon - can’t they just agree to dig the ditch and we’ll provide the water and alligators (or better yet, Mutant Sharks with fricken’ lasers attached to their heads)?
Come on El Cid you know that the alligators would end up as boots, belts and asada and Mexico would start illegally importing mutant shark tacos and make a killing. They would use the lasers on the Border Patrol.
Its like the idea of an electric fence....every home and business in Mexico would have a extension cord attached to it. Talk about free energy.