Bull feces. The border is open, because the bosses in DC want it open. It can be closed simply by dropping our meant-to-fail "Keystone Kops" aproach, adn adopting "wartime rules of engagement" to prevent the possible infiltration of terrorists.
As far as morality goes, once the new ROE were clearly promulgated, FEWER Mexicans would die crossing the border than they do now, because they would stop trying to cross. What leads to MORE Mexicans dying in the desert, is holding out the promise of amnesty, drivers' licenses, "guest worker" cards etc.
So if you really want to save their lives, then you will support closing the border.
BTTT
I guess today we AREN'T at War.../bs
What specifically are the wartime rules of engagement to police the mexican border? That's 1000s of miles - specifically how can that be made impenetrable without resorting to draconian tactics?