(EDIT 1/20/2010-See below)
This article ("Another Reason America Is At War") from the Chicago Sun-Times pretty much says it all. It's consistent with the notion that the only reason why the U.S. hasn't suffered a catastrophic terrorist attack since 2001 is because al Qaeda keeps sending incompetent mopes to attack us (i.e., Richard Reid and the latest chuckle-head).
For some years after 9/11, passengers were forbidden to get up to use the lavatory on the Washington-New York shuttle. Zero tolerance! I suppose it must eventually have occurred to somebody that this ban would not deter a person who was willing to die, so the rule was scrapped. But now the principle has been revisited for international flights, and fresh idiocies are in store. Nothing in your lap during final approach. Do you feel safer? If you were a suicide-killer, would you feel thwarted or deterred?The full column can be found here.
Why do we fail to detect or defeat the guilty, and why do we do so well at collective punishment of the innocent? The answer to the first question is: Because we can't -- or won't. The answer to the second question is: Because we can. The fault here is not just with our endlessly incompetent security services, who give the benefit of the doubt to people who should have been arrested long ago or at least had their visas and travel rights revoked. It is also with a public opinion that sheepishly bleats to be made to ''feel safe.'' The demand to satisfy that sad illusion can be met with relative ease if you pay enough people to stand around and stare significantly at the citizens' toothpaste.
Edit 1/20/2010: Steve Dahl's 1/13/10 column in the Chicago Tribune, Feeling naked and alone in the security line, repeats the question: are our reactive security measures making us more secure?