Paarmo, do you really believe that a terrorist will pressure a pilot to smuggle a swiss army knife for them? Besides, you can steal knifes in the restaurant kitchens inside the security zone, or why not pressure a cock in said restaurant to give them a knife?
Itīs not unthinkable that terrorists will pressure a pilot to smuggle a pistol or a bomb (not liquid, they can bring that in themselves, deciliter by deciliter) so then search pilots for bombs, pistols and such, not nailclippers, multi tools, water, etc.
And Paarmo, what about the wine bottles aboard aircraft? The bottles are made of glas and a terrorist can easily take one, brake it and have a leathal weapon.
Anyone else heard of the egyptian captain who killed a hijacker with a fire axe?