They are using that and have been. The point is to delay them so that air and ground assets can get to that location or prevent them from entering all together without the need of other assets. Force the enemy into using other means which use standard border entry where other technology like dogs, scanners, human assets, ect are used.
Proper walls work. We MUST protect our borders. This new wall yes its expenssive however it will pay for itself over the decades and be cheaper in the longrun.
I cant believe liberratians are calling for building bridges and open borders. The constitution is clear when it comes to the govt protecting our nations security
