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@bmdrocks21
Ah, so we're finally back to this. Alright, let's cover it.
First off, it's not just about staffing the border. Israel has a far greater number of troops per its size, as well as a greater capacity to staff its borders. I agree that there are limits to their effectiveness in the latter capacity (though we probably would not agree on the numbers you're using), though not in the former, so even if we mobilized every person in the military reserves, I don't think it's possible to match or even come close to Israel's deterrence resulting from sheer force of numbers.
Second, the amount of our GDP is really besides the point. Saying that we have more money to throw at the problem is technically accurate, but much of that money is already being used towards other ends. It would have to be stripped out from those and continually used to upkeep the wall. Also, you say it's "only a little over 13x larger", but that's not inconsequential. We aren't copying their wall design (in fact, we're spending about two times what they did to build theirs) and our maintenance costs are similarly quite a bit higher, with our cost per mile being $77,000. We're talking about roughly 2000 miles, so roughly $150,000,000 a year. We may have the GDP to cover it, but it's not small. https://www.washingtonexaminer.com/copying-israels-wall-would-cut-trumps-price-nearly-in-half
Third, yes, it's not impossible to construct a border on this terrain. So, let's see how well we're doing:
If wind alone is a problem for it right now, that means this will require reassessing and rebuilding, increasing costs still further. As for solving for every bit of terrain, it seems issues like floodplains and wildlife habitats aren't so easily solved, nor are issues of lost commerce across the border (much of which takes place entirely legally). I'd say it's impossible to both address the issues with building such a wall and see to it that building said wall doesn't cause any harm to the surrounding environment or dramatically increase costs.
Fourth, I'd like to see you point out what laws among those in our immigration statutes address the same issues as the legal responses from Israel, though that's really besides the point. If those legal avenues alone have been effective, then why would a wall be more effective? That's what I was getting at here. You're the one saying that it's "an indispensable part" of any effort, so for me, the fundamental question is: why are other measures insufficient, and how would a wall bolster them further? I'm not seeing much in the way of response to that.