Great, makes it easier to shoot them while they are on top....
You didn't mention guard posted every 50 feet for 2000 miles. Yeah that's a good idea. That would mean 200,000 guards at your fine salary of 45k per year or roughly 9 billion dollars every year to guard it. Not including housing, pensions and management. Figure 30% overhead for all of that, so up the cost of guarding the wall to 12 billion
So, 50 billion to build the wall
12 billion a year to guard it
budget 5% of building cost per year for repairs or 2.5 million per year maintenance cost
And you are concerned about the government spending too much. LOL
What value does the US taxpayer receive for this expenditure?