But the TSA can't stop bombs from entering the airport.
Downing a plane is easy but it wouldn't do much damage to the nation. Imagine instead, suicide bombs set off by islamists at the security gates in several major airports during rush hour. How long afterward would it take to get our airfleet back into the sky? Would you then advocate profiling? Instead, would we have to be screened before we could purchase a ticket or even to aproach the airport?