The TSA can be a real pain to deal with. Thanks a lot, bin Laden. However, they make it easy to forget how awful they are to deal with by running a top notch Instagram game. Also, there are idiots in the world, and the TSA protects John and Jane Air Traveler from those idiots. Sometimes those idiots need to fly on airplanes to get to their idiot conventions and put things in their carry-on bags that only idiots would try to bring on an airplane.
Also, they have dog pictures!