Can't view the whole article for free, Theo, but what is there gives the gist of where it's headed.
So, we should ban games that teach good hand/eye co-ordination lest terrorists use them to teach how to shoot straight?
I agree: it's the not the knowing how to fly (there are other ways to train pilots, inlcuding flight schools - should we close all flight schools to Arabs, for instance, just in case one might be Osama?

), it's the preventing someone with the knowledge the opportunity for using it inappropriately. Lock the cockpit door, and secure the area.
Cheers
Mick