That's easy. Terrorists seize/destroy planes with weapons or explosives. So to the extent that the TSA can efficiently and effectively scan for weapons, explo

That's easy. Terrorists seize/destroy planes with weapons or explosives. So to the extent that the TSA can efficiently and effectively scan for weapons, explosives and known terrorists, they should. To the extent that they can't detect certain explosives (the theoretical binary liquid concern), it's reasonable to take measures to mitigate risk. (E.g. limit quantities when feasible) Beyond that? Nothing.