The trouble with all security is that it only takes one idiot to find a way of manufacturing something to bring an aircraft down followed by a cry "Why did we not see this coming ?- who is to blame?" It is also worth remembering that whatever we do in the UK or Europe or the States has to be matched at ALL down route airports. Can you seriously see this happening?
As a passenger I would always consider aggravating security such as the liquids matter as worth tolerating just for safety's sake but what about down route - are they as fastidious? I doubt it.
It must be an absolute drag for aircrew (i'm only a week-end pilot) but the very nature of this frustration could be the opportunity for some maniac to get something on board.
It is an old maxim that " The price of peace is eternal vigilance" and so it is with security. An absolute "pain in the butt" for some but just an aggravating nuisance for everybody else.
