I've dealt with all the stated objections. They are all absurd.
I find the corruption the strongest argument . A coyote or "poyero" will charge between 3,000 and 5,000 per person to take each person across the border. Now let's assume they handle groups of 10, and that half of the money is used for bribes. It is all a matter of how many agents they will have to bribe. If it is one agent,then recieving 25,000 just for turning the other way at the right time seems like a sound option. With five agents it would become harder 5,000 is not too compelling when you can loose your job and face jail time. So probably the answer would be to add more deterrents and more guards, which would increase the operating cost of the "fence".
It's really tough to bribe land mines and machine guns on motion detectors, dude.
Ah, yes , another way to cross the border : ultralight aircraft.
Marijuana Smugglers using ultralight aircraft to carry marijuana - Los Angeles Times
Never seen an ultralight that could outrun an attack helicopter.
Land mines in US soil !!!!
Dude , you are out of your mind !!
Motion detectors ok, even the fence is ok ( primitive but acceptable), but mines !!! What happens when an unaware citizen happens to get close to the border? No way.
Ultralights can't outrun an attack helicopter, they are just very hard to detect.
Turn the border into a no-man's land...the area should be clearly marked, difficult to get into (closed off with electrified barbed wire), but anyone going in should end up dead.