Having a last line of defense is an acknowledgement that the previous lines might fail. (of course they might, the last line might fail too) They have so much invested in all the TSA bs they can't admit any possibility of failure.
BTW, do they still have air marshals, or did that program get trashed already?
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"Everything they do is so dramatic and flamboyant. It just makes me want to set myself on fire!" —Lucille Bluth
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