First, take a peak at what security guru Bruce Schneier has to say:

Hours-long waits in the security line. Ridiculous prohibitions on what you can carry onboard. Last week’s foiling of a major terrorist plot and the subsequent airport security graphically illustrates the difference between effective security and security theater.

None of the airplane security measures implemented because of 9/11 — no-fly lists, secondary screening, prohibitions against pocket knives and corkscrews — had anything to do with last week’s arrests. And they wouldn’t have prevented the planned attacks, had the terrorists not been arrested. A national ID card wouldn’t have made a difference, either.

Instead, the arrests are a victory for old-fashioned intelligence and investigation. Details are still secret, but police in at least two countries were watching the terrorists for a long time. They followed leads, figured out who was talking to whom, and slowly pieced together both the network and the plot.

The new airplane security measures focus on that plot, because authorities believe they have not captured everyone involved. It’s reasonable to assume that a few lone plotters, knowing their compatriots are in jail and fearing their own arrest, would try to finish the job on their own. The authorities are not being public with the details — much of the “explosive liquid” story doesn’t hang together — but the excessive security measures seem prudent.

But only temporarily. Banning box cutters since 9/11, or taking off our shoes since Richard Reid, has not made us any safer. And a long-term prohibition against liquid carry-ons won’t make us safer, either. It’s not just that there are ways around the rules, it’s that focusing on tactics is a losing proposition.

It’s easy to defend against what the terrorists planned last time, but it’s shortsighted. If we spend billions fielding liquid-analysis machines in airports and the terrorists use solid explosives, we’ve wasted our money. If they target shopping malls, we’ve wasted our money. Focusing on tactics simply forces the terrorists to make a minor modification in their plans. There are too many targets — stadiums, schools, theaters, churches, the long line of densely packed people before airport security — and too many ways to kill people.

Security measures that require us to guess correctly don’t work, because invariably we will guess wrong. It’s not security, it’s security theater: measures designed to make us feel safer but not actually safer.

Airport security is the last line of defense, and not a very good one at that. Sure, it’ll catch the sloppy and the stupid — and that’s a good enough reason not to do away with it entirely — but it won’t catch a well-planned plot. We can’t keep weapons out of prisons; we can’t possibly keep them off airplanes.

The goal of a terrorist is to cause terror. Last week’s arrests demonstrate how real security doesn’t focus on possible terrorist tactics, but on the terrorists themselves. It’s a victory for intelligence and investigation, and a dramatic demonstration of how investments in these areas pay off.

And if you want to know what you can do to help? Don’t be terrorized. They terrorize more of us if they kill some of us, but the dead are beside the point. If we give in to fear, the terrorists achieve their goal even if they were arrested. If we refuse to be terrorized, then they lose — even if their attacks succeed.

And follow that with the disclosure from Homeland Security that x-ray machines can’t find explosives, but of course we’ll still have to take off our shoes:

Findings from the report, obtained by The Associated Press, did not stop the Transportation Security Administration from announcing Sunday that all airline passengers must remove their shoes and run them through X-ray machines before boarding commercial aircraft. (…)

In its April 2005 report, “Systems Engineering Study of Civil Aviation Security — Phase I,” the Homeland Security Department concluded that images on X-ray machines don’t provide the information necessary to detect explosives. Machines used at most airports to scan hand-held luggage, purses, briefcases and shoes have not been upgraded to detect explosives since the report was issued.

We are allowing ourselves to be ruled by fools and idiots.