There's a pretty simple solution.
Use the resources to look for explosives.
Use the resources to profile, target behaviour and target terrorist related activities (and those who might have terrorist ties).
Accept the fact that someone is ALWAYS going to slip through the cracks at some point and have a real plan which is prepared for this eventuality.
Stop being silly about targeting objects which are no more or less dangerous than anything available on the aircraft. Box cutters and knives are no more suitable weapons than anything carried or able to be improvised on any aircraft.
And get away from the nanny state feel good solution of villifying tools.