Because TSA has convinced the world that the only way another terrorist act would happen is exactly the same way it did last time.
Can you say bunch of idiots running the government?
Also, we are oh so worried they will blow up in the airplane, so what does TSA do in America - throw all the highly unstable potential blow up liquids in a big garbage bin in front of security so when that terrorist shows up with that liquid, it will explode with the rest of the people outside security. Those human lives probably weigh less than those on the actual airplanes.
What a show.