That wall will save us billions
Building, maintaining, and manning the wall will cost billions upon billions over the decades
Yes, let's talk about some of the costs normally not considered.
1. No roads. Many of these areas have no roads whatsoever. That would mean roads would need to be built just to get equipment and supplies into the area.
2. No nearby communities where the wall is being built. That would mean that workers would have to be brought in to temporarily live in the areas where the wall is being built, plus we would have to provide housing, showering facilities, heat and AC, food and food preparation, etc.
3. No nearby stores. Because of this, all supplies would have to be shipped in, including fuel, fuel for generating electricity, water, refrigeration units, heavy equipment, concrete, sand, rocks, wood, bricks, rebar, and on and on.
4. Since this would be a work area without any kind of a typical support network, there would also need to be medical personnel of some kind and people to work as a small police force for security.