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The horrific death of at least 10 immigrants sneaking across Texas this weekend in the back of a tractor-trailer rig with no air-conditioning is a tragic reminder of the lengths people will go to in pursuit of a better life. It’s also a grim, cautionary tale about greedy predators who stand ready to capitalize on that greatest of all human suffering — that irrepressible yearning for a better life; in this case, a shot at the American dream. It’s small solace that the driver of that rig was arrested and charged Monday with illegally transporting the immigrants, nearly three dozen of whom were found in a Wal-Mart parking lot in San Antonio. The question we all should ponder now is this: What can we do to stave off such tragedies, and to shut down sinister underground enterprises that exploit a vulnerable, yet steady stream of desperate souls? Telling people to come into the country legally doesn’t work.