I think it would be much more effective to build towers along the southern boarder, spaced about two miles apart, each with a Marine sniper. ROE are: Shoot to wound. Those who are caught get a big “I” (Illegal) tattooed on their forehead and then sent back to Mexico. Any sniper seeing a target with a big “I” on their forehead allows them to change the ROE to whatever seems appropriate. Much less expensive than a conventional wall, but just as effective.
Yes. And just think, econ...it only has to happen once or twice. They WILL get the message.