IMAGINE THE HEADLINES if the population of Harlingen, Pflugerville, or North Richland Hills were wiped out by a natural disaster like a flood, hurricane, tornado, or by terrorist attack. Or if 18 airplanes crashed in Texas, with no survivors, every year for the last 22 years. We would all be shocked and horrified at such an incomprehensible loss of life. And yet, since Nov. 7, 2000—the last…