“They can overturn the multi-billion dollar concrete wall by handing visas to everyone at the door.”
Well then you shouldn’t have any objection to building the wall since you think it won’t work anyway.
Unlike liberals, I don't believe that money grows on trees and that the billions of dollars it will take to build a wall must come from somewhere. If we are going to have solutions that don't work, we might as well go with the cheapest one. We've never even tried enforcing our laws. Maybe we ought to look t doing this before a multi-billion dollar wall?
Anyhow, why not a minefield? It's probably an order of magnitude cheaper than a wall and immensely more effective.