Well I would suggest that the operating Captains were unlikely to be using the knives and laser guns in a hijacking attempt. There are plenty of devices on board I could use if I wanted to do that! Many of the current restrictions on flight crew are, quite frankly, petty. If I want to kill the other guy I wont do it with the two inch blade swiss army knife in my bag.
By all means lets x-ray crew bags, perhaps something has been concealed in them when we're not looking. Lets have a thorough check of IDs, because any muppet can get a pilots uniform and we don't want them airside. Lets not try to kid ourselves that operating crew are going to hijack their won aircraft.
If we want to stop this sort of thing happening again then the first thing we need is profiling of pax El Al style. That does far more to defeat the terrorist threat than some underpaid and often disinterested security guard looking for a tiny concealed weapon.