Smugglers here have actually stolen horses from ranches to pack their drugs on, waiting for them to get ahold of some broncs one day...
Put together a small group of retired spec-ops people and start hunting these bastards down. No jail, no ICE, no border personnel.
Find the scum, cut out their innards and feed them to the buzzards. The more torture and the more gruesome the act the better.
The way you get rid of terrorists is to terrorize them.