Especially since the TSA actually accomplishes almost nothing in preventing deaths. All a terrorist about to be discovered at the airport security gate would have to do to complete his deadly mission would be to detonate his bomb right then and there. It would cause people to fear airports and security gates and mess up the whole system. Terrorism is all about sowing fear that the government can't protect you. The TSA just shifts some of the risk from the airplane to the airport. You can't security check everything in life. Better to figure out why people want to detonate bombs in the first place and solve that problem. But symbolic solutions are so much easier.