Thank you for admitting I was right.
You are welcome. I said you were right many times, specifically about:
1. It is cheaper and faster in a lot of cases to do surveillance instead of a wall.
2. An important part of the solution is to remove the motivation for illegal immigration (prosecute employers, don't give illegal immigrants free stuff and let them stay, etc.).
The problem is that both of those things rely on administrations doing their jobs.
But we know that doesn't happen sometimes. There come administrations at times who will be against it, don't do it, and maybe actively undermine it.
Walls are resistant to such vagaries.
Even if you are building a wall, though, you don't build it up a cliff. You build it on parts that people can or previously did cross.