Unfortunately 'Tinstaafl' didn't seem to agree with my previous message about being supportive.
I think everyone would agree that Security will never be and can never be 100%. Yes the Pilot can fly the aircraft into whatever he/she desires, yes engineers carry tools airside but as I already said, Security is a deterrant to the general public. They see Security personnel remove items that pose a possible threat and it, on the whole, makes them feel safer - keeps them flying.
There are a multitude of measures used by Airlines, Airport Authorities and other airport users, under direction from DfT to safe guard flying to the best possible degree whilst keeping us all in jobs i.e. keeping the operations moving. TOTAL security wouldn't make any aspect of aviation commercially viable but i'm sure that the Department for Transport believe what they're directing is appropriate against the threat.