[tptacek]

Because then you have to get two suicide bombers on the plane at the same time.

By all indications, the 9/11 bombers were very high on the AQ food chain. The underpants bomber didn't get tens or hundreds of thousands of dollars wired to him before the op; he was a shmuck, in a strategy designed to weaponize schmucks.

If a TSA measure doubles the manpower required to carry off an AQ op, it is almost prima facie "effective". Is, I think, the logic you'd deploy against the "combine the 3oz bottles" argument.