These ass hats haven't figured out that the same cartels that smuggled them in would gladly smuggle back, for a modest fee of course. Greedy people without a conscience are easily bought and controlled. After Trump gets back in office, Mexico will change their tune for the same reason.
You won't see them unless their transponders are on ad the fighters usually keep them off. For what it's worth, I don't see a reason to be concerned with US fighter jets over CONUS. Helicopters and other troop transports are of high interest as well as Intel gathering vehicles.
It's hard when you already know the truth and you're just waiting fr the masses to catch up.