Derek points out some of the weak thinking at the TSA with a personal example. The last time I ravelled, I had something else occur to me in terms of threats - the huge backup in front of the security zone. Think about it - there's the TSA, asking you to remove your shoes, take your laptop out of your bag (and going on breaks in the face of huge lines, but never mind that) - the whole dreary experience. The result is a huge line in front of security, and most airports have reacted to that by putting in theme park style maze lines.
Now look at that situation. If you really do want to commit an act of terror, do you care whether the dead bodies are on the plane or not? What the TSA has unwittingly created is a target rich environment in front of the screening area - a huge mass of compliantly waiting, penned in people with nowhere to go. I can't wait to see what stupidity the TSA comes up with after this gets exploited by a bad actor somewhere.