Green Maned Lion
Engineer
First of all, within about 5 years all airline terrorism would stop dead in its tracks. Terrorism is the act of causing disorganization through fear, and the very act of responding to it- in ANY way- makes it a success. A terrorist attack does not need to reach its completion for it to succeed, a point far too many people ignore. If we stopped responding at all to terrorism in the air, terrorism in the air would stop because it would no longer be effective at its purpose.What is your answer for what should be done? Take away all security? What would happen on airplanes and in airports, then?
Secondarily, hijacking of airliners for more simple reasons (piracy being the main one I can think of) would increase significantly.
But to get back to my main point, the purpose of the 9/11 attacks weren't to bring down a couple of landmark buildings. The purpose was to create the lock-down security we now have to go through, living in fear of another one.
Security can and should be unobtrusive. Profiling is a key to sensible security. Not necessarily of race (although it should contribute) but also age, emotions, history, decorum, and tons of other items. Dangerous people do tend to fit into a certain pattern. As for instance, a skinny woman dressed in skintight pants and a skintype halter, wearing thin sole sandals is NOT carrying a bomb on their person. Ignoring a bodily search of such a person makes sense. Someone wearing baggier clothing? Well, you have a chance of something being hidden there.