That gives me an idea. They're pretty gullible South of the border -- "Cupacabras" is believed by millions, and rumors spread like wildfire. Well, let's start a rumor about some large freaky beast that migrates (by air) from the Gulf of Mexico to the Gulf of California and whose route takes it approximately across the full length of the U.S.-Mexico border. It does its flying only at night in remote areas, and that's why there are no pictures of it. (In the day it rests, and camouflages perfectly into the landscape). When it hunts, it swoops down and picks off animals up to 250 lbs, leaving no trace of them.
If this rumor successfully spread it would be more effective than a full deployment of the National Guard.
Good Psyop idea. Air-drop the pamphlets....
It's time to get inside their heads and do some "work" ..
I've heard stories (just stories, mind you) of Border Patrol guys taking their night vision goggles, turning them around so the eyepieces show towards the illegals, and making a hissing noise. The result is that the illegals see two glowing green "eyes" and hear something hiss at them...end result is that someone yells "Chupacabra!" and everyone hauls butt south.