This is a stupid game, and we should stop playing it.
It's not even a fair game. It's not that the terrorist picks an attack and we pick a defense, and we see who wins. It's that we pick a defense, and then the terrorists look at our defense and pick an attack designed to get around it. Our security measures only work if we happen to guess the plot correctly. If we get it wrong, we've wasted our money. This isn't security; it's security theater.
There are two basic kinds of terrorists. There are the sloppy planners…and even pre-9/11 airplane security is going to catch him. The second is the well-planned, well-financed, and much rarer sort of plot. Do you really expect the T.S.A. screeners…to stop them?…
Exactly two things have made airplane travel safer since 9/11: reinforcing the cockpit door, and convincing passengers they need to fight back. Everything else has been a waste of money…Take all the rest of the money and spend it on investigation and intelligence.