What seems to have been (conveniantly) 'forgotten' in the intervening period since 9/11 is that no failure of airport security occurred on that day. The only latent failure was that of the intellegence community...again!
For the most part money spent on airport security in Australia since then has been wasted...any self respecting terrorist could have and still could get whatever they need airside and onto the aircraft and then the terrorists board through 'security'.
But if/when they do they can't access the cockpit because we are all locked safe in the cockpit and fully aquainted with the repercussions of opening said armoured door.
So what usefull purpose has the increased agravation to the travelling public/aircrews served? About the only one I can see is the terrorists are incapacitated with laughter at the collective stupidity of our elected officials and the empire building morons they have placed in charge of 'protecting' us.