You have to solve the problem – not just treat the symptoms.
Sure, but the first problem is that several thousand people have daily access to aircraft. The second problem is that our community contains a certain percentage of criminals. Fortunately, in this country almost all of those criminals are into drugs, weapons, theft and pornography rather than ideological acts of terror. There is no method of completely excluding criminals from a workplace, no matter how stringent the checks and surveillance.
As for the airports, you can screen those thousands of people, but only to a certain degree until it costs an absolute fortune and starts to affect aircraft turnaround times. Searching trucks properly takes time and manpower, and there are a heck of a lot of trucks coming into an airport. This is without considering the screening of tens of thousands of airside workers, many of whom repeatedly cross between airside and landside twenty or so times a day.
It can be done, and several countries do it, but the cost, time and infrastructure requriements are BIG. In a place with few actual terrorist incidents, you have to ask if it's worth the money and hassle factor.
I know that sterile area screening is an embuggerance because I worked in terminals for some years, including positions that required frequent too-ing and fro-ing through the screening points, many times a day. It's a pain in the arse, a total waste of time and nothing more than a gesture, but the public want it (according to the screening review), it keeps the crazies under control and it's not going away. You may be dismissive of crazies, but most actual security incidents at Australian airports have involved people with mental health issues, the Sydney bikie debacle being a notable exception.
Any other 'initiatives' will be over and above the existing circus, and don't expect anything other than poorly trained, badly paid subcontractors. If the government was remotely serious about airport security it would have taken back the screening points on 9/12 but it didn't, so it isn't.