What a steaming load of bullcrap.
Here is what most of our southern border looks like: there is no fence at all, just whatever is left over from some forgotten cattle fence, built privately to keep U.S. cattle from wandering freely into Mexico. For comparison, below it is a sample of an inexpensive but highly effective double border fence system, with a plowed strip to reveal footprints.
Here is what some of San Diego County has, a wall made of rusty VN era runway mats. The corrugations are parallel, to make climbing easier. These illegals were spotted by unexpected civilian volunteers, and jumped back over the border.
Here is what the border looks like where the runway mat wall exists. Mexico begins on the other side of the ineffective rusty wall, which actually helps the smugglers, by hiding their movements until the BP has driven out of sight.
This is how "the game" is played. Smugglers hide on the other side of the wall with their dope and/or their illegals, out of sight of the USBP. They wait for the highly visible white BP vehicle to drive over the distant hills. Lookouts with cell phones and walkie talkies report on the location of the BP units. They know with certainty that "the coast is clear" for an hour or two, and the smugglers and illegals hop the fence and run into the scrub only 50 yards away. From there, they are out of sight, and they walk 1-2 miles to holding houses. Then they wait for nightfall, and are picked up and driven in vans to LA or San Diego.
Lastly, below is the Duncan Hunter 15' fence, which is already being built along a few "showplace" miles of San Diego, mainly near the ports of entry. The House has approved building 700 miles of it, which would be a great start. As you can see, the rusty runway wall is seen at left. In areas with the 15 foot fence, dope smugglers and illegals will have to cross 50-100 yards of open sand road ("the government road" as it is called) before starting to try to get over the 15 foot fence. It's extremely tough, and resists cutting. Attacking the fence would have to be done in the open, right on the open sand, in full view of cameras. This type of fence, on the U.S. side of the government road, will give the USBP a barrier to patrol, instead of forcing them to chase illegals around 100,000 square miles of wide open frontier land, which is a fool's errand.
So don't tell us modern fence systems won't work, we're not all as stupid as six year old children.
Be honest for once, and admit your true agenda: open borders, and an end to American sovereignty.