I think you just answered your own question...
Association of Independent Voters? Doesn't sound too independent.
Poll time. How many more American civilians will have to be slaughtered by murderous Islamic lunatics before we get serious and start seraching all Islamic men between 18 and 50 who look and act suspicious? My bet is 3,000 - 5,000 more innocent Americans must die.
Place your bets...
Your theory sounds good, but if we started only searching people of Middle-Eastern descent, how hard would it be for the terrorists to send in someone who is fair-skinned or even a white American? They would be pretty much guaranteed not to get searched. Granted, they would probably have trouble finding someone like that, but it wouldn't be the first time either.