- They have compulsory military service, ensuring that they can effectively guard much of that wall
They might be able to afford a higher density based on troops to area. However, I don't believe the source prescribes a particular amount of troops per mile of fence. So, while they could technically have (615,000 reserve and active duty/150) 4,100 troops/mile, I know they don't do that and that they have no need to. If, let's say, it is wise to have one troop per 1/16 of a mile, we would need (16*2000) 32,000 troops/border patrol agents, which we could easily afford based on military reserves alone.
- They have a much shorter border to guard, ensuring that they can effectively upkeep the wall. From your source:
While yes, they have a shorter border, our GDP is over 55x the size of Israel's, while our border is only a little over 13x larger, so having the resources to maintain such a wall isn't too worrisome.
- The terrain on which these walls have been/are being built is very different. From your source:
True, it will be harder to construct a wall on our border, but it is by no means impossible.
- The legal response has been different, and it has been much better correlated with Israel's success. From your source:
B) Stating that simply having the border wall would be enough is problematic in its own right. The very article you cite talks about what border security measures are actually the most effective, many of which we use right now:
Trump has actually been enforcing laws that have already been on the books regarding immigration enforcement. Further implementation of stricter laws, which could easily occur if Republicans win the next election, could contribute to more legal ramifications/deterrents for illegal immigration. However, I don't believe I have said, or if I did, I had no intention to say, that a border wall is some panacea for illegal immigration. It is merely an indispensable part of what would have to be a multi-faceted approach of adding troops, altering laws, and providing more technology to help detect illegal immigrants, etc.
On a side note, I would say Democrats are adding many obstacles to discouraging illegal immigration, as they have said they will provide "free" healthcare to illegal immigrants, stop deportations (in the case of Biden, supposedly just the first 100 days), and proposing other laws that would be much more lenient on illegal immigrants. But, they can be ignored because the wall wouldn't even be completed if they were elected.