I see... You're wrong, of course; killing an intruder solely for intruding is murder.
But your proposal is that government machine-gun people caught near the border. Hmm. How is that different fromm, say, East German border policy?
No need for that. The property owners whose land these illegals trash and whose families they terrorize as they pass through can deal with them. Or the desert can take care of the problem as we close down the easy-crossing parts of the border and funnel them into the desert areas... patrolling to keep the "do-gooders" from providing water and food to them. No need for government guns to do the job at all.
And if you fear for your life, as any REASONABLE and RATIONAL householder would, it is self-defense and NOT murder to kill an intruder. These illegals and their "coyotes" are and have been PROVEN to be threats to the very lives of the property owners along the borders.
People were trying to flee an evil regime there. Here, they're breaking and entering, and it's costing taxpayers billions--(using our own govts. force to take it, yet.) What a compassionate racket.
Take it out of your own pocket, Mr. Geek, I've got better things to do with my money!
Easy. East German machine guns were trying to keep people in. Did you have a problem with the logic and "reasoning" portions of the SATs?