The sad point is that the TSA and other airport security is impotent. There are more loopholes and screwups than most frequent flyers would care to know about and it doesn't take internet publicity or an IQ over 90 to figure them out. In fact, I'm sure most frequent flyers could spot a weak point in a minute.
The terrorists are either stupid or non-existant. If this weren't true, then it's a wonder why nothing has happened lately.
My money is on non-existant. The USMC and US Army have been killing them at high rates every day for the last three years.