Thank you, PriusDriver, for stating what should be obvious, but clearly is not.
The TSA is a horrible waste of resources. Every study or test conducted that has been allowed to see the light of day demonstrates that this agency accomplishes little or nothing beyond making air travel difficult and frustrating. Their processes primarily affect ordinary citizens, not potential terrorists, and I believe the intent is to keep people frightened in order to facilitate the not-so-gradual destruction of freedom and civil liberty, and hasten the descent of this nation into fascism.
A secondary purpose is to give the illusion that something major is being done in connection with air travel security. Most of the TSA staff are the same people who used to work the security checks at airports for minimum wage before 9/11; they simply were Federalized a few months later. Most were incompetent then, and they still are. A major difference is that they now have badges and far too much authority. They also are able to steal the possessions of people who fly, an event that happens fairly frequently.
Terrorists intent on destroying aircraft are unlikely to use the same playbook that was followed in the past. Nevertheless, virtually every security measure is focused on previously employed tactics. We are really lucky that the mentally unbalanced shoe bomber attempted to use the method he chose. If he had hidden his explosives in an anal suppository, airport security checks would be much more unpleasant.
Inspection of hand luggage has been the norm for many years. No real changes were needed, beyond increasing the quality of both the personnel and the process. Securing the air crew compartment was an obvious need that had been pointed out repeatedly, and the lack of such security was the principal element in planning the 9/11 attack. Correcting this glaring weakness would not have inconvenienced anyone, and had it been done many years ago, when various groups representing the interests of pilots requested, the 9/11 scenario would not have been possible.
The presence of the TSA does not make us one bit safer; most of the security measures that have been imposed are worthless, and the restriction on liquids is truly ludicrous. The origins of most of this idiocy can be found in corrupt and deceptive government policy, and is made possible by cynically orchestrated public hysteria.
"When I reflect that God is just, I fear for my country." (Thomas Jefferson)