Its all a media beat up. There is no such thig as perfect security, nor will there ever will be, its the nature of the beast. A huge area, thousands of staff, thousands of people in and out constantly all day + equipment, cargo, planes etc.
Anyone who works at the airport or any airport for that matter will get to know the system and ultimately get around almost any security measure that can realistically be put in place.
The only way you can have 100% security is to get rid of the planes, pax, staff, build a 50 foot high wall around the entire airport complete with a moat.