One of the most respected bankers in Nigeria walks into the local American Embassy and dobs on his son, informing the US, in unambiguous terms, that his boy is going to carry out a terrorist attack.
US intelligence fails at every hurdle, and doesn't consider this direct knowledge sufficient, or sufficiently credible, to cancel the son's visa to the US.
We know the rest.
Joining the dots is a difficult business, isn't it?
Instead of writing a memo insisting that mum's and dad's knowledge of their kiddie's activities trumps casting a steely eye of suspicion over lip balm and little containers of shampoo, the US responds by restricting passengers to their seats for the last hour of a flight (never mind your irritable bowel, or incontinence problem), such time having to be spent sans anything in the lap - no blanky to keep you warm, no book to keep you entertained.
Sure, that oughta do it.
At least for terrorists who wait until the last hour of a flight before acting, and who like to keep themselves snuggly-warm during the flight.
Yes folks, we must continue to pray there is intelligent, rational, life somewhere in the universe.
I wish they'd hurry up and get here, things are becoming downright embarrassing.