An unmanned wall can be defeated with a ladder! A LADDER. You still have to man the wall with enough men, at all times, to stop people. I don't need a Democrat to tell me that. I can go to the border and film it for you, lol. Walls don't work.
For a taller wall, they drive a big box truck up to the wall and haul the ladder on top of the truck. Then they use ropes to lower themselves down to the other side.
For the lower walls they just use two ladders. Once they get up the first ladder, they throw the other ladder over the wall and crawl down. Or they use blow torches to cut through the wall. Or they tunnel under. But mostly they go over.
You need something better than an unmanned wall. You know, something that hasn't already failed.
Ever carried a 40 foot ladder through the desert? How about dragging a blowtorch or tunneling equipment?
Try climbing the wall, cutting it, or try to dig under it and the sensors contained it will alert the border patrol and tell them exactly where you are!
Carry it through the desert? WTF? They just drive it right up to the wall on the Mexican side. Nobody stops them. Also, they don't carry the ladders with them into the United States for pete's sake.
Unless the border patrol is stationed every 100 yards, they will not get there in time to stop the folks coming in over, under and through the wall. We see it every day here on the border. Even in San Ysidro where we have the busiest border crossing in the world. People are still able to cross illegally.
If I wanted to cross into Mexico illegally, I'd go to the ocean and go around the wall where it ends at the water.
Walls are effective when they enclose something. A freestanding wall is easy to defeat.