Read this essay from a former head of security at Ben Gurion airport:

For a bunch of people in snappy uniforms patting down crotches, the TSA is remarkably unpopular. Nobody likes going through security at the airport, but you probably figured most of it had a point. All those hours spent in line with other shoeless travelers are a necessary precursor to safe flying. It’s annoying, but at least it wards off terrorism.

That’s all bullsh%$. The TSA couldn’t protect you from a 6-year-old with a water balloon. What are my qualifications for saying that? My name is Rafi Sela, and I was the head of security for the world’s safest airport. Here’s what your country does wrong.

He is clear, and concisely explains the systemic problems present in the agency.

This is the money quote:

Of course, after a little while it came out that these scanners were useless. I could strap a bomb capable of taking down a 747 to my body and walk right through a body scanner. Nobody would catch me. I’d rather not explain exactly how, but this German man was able to sneak a fake bomb through the same scanners without being caught. And he did it in Germany, a country where “airport security officer” isn’t a synonym for “failed Walmart cashier.”

His basic thesis is that the organization is fatally flawed because it is designed to regulate itself.