You realize that it IS illegal to use deadly booby traps to protect your own personal property, right?
Of course. Setting deadly booby traps is a privilege the goverment reserves for itself. And fair enough too -- the setting of deadly booby traps should be very well regulated to ensure that there's absolutely no way that anyone can wander into the trap without knowing (a) it's there and (b) it's very very deadly.
The purpose of this sort of trap is not to kill or maim anybody, it's to ensure that it never kills or maims anybody by being so obviously deadly that nobody would be stupid enough to ever attempt to cross it. Let's face it, life in Mexico isn't so bad that it's worth facing a 99.9% chance of death in order to escape it.
Yes, it's not so bad in Mexico. Nobody would ever attempt to run across a minefield to escape grinding poverty and bloody wars waged by rich and powerful drug cartels fueled by demand from the United States.