All about votes & easy money
This issue is not about security it is about protecting the reputations of the politicians from the media when the a terrorist act happens, it lets them stand up infront of the camera's and say they had taken appropriate action.
Meanwhile in this atmosphere of paranoia a bunch of chancer's who twenty years ago would have been selling double glazing have picked up the security issue, ramped up the paranoia a few notches and made a lot of money employing bottom grade staff and charging premium prices using the added value of the security tag as justification for this profiteering.
Add airport managers who have been emerssed in the elf & safety culture and you have the recipe for the banning of baked beans and other such stupidity in the interests of national security.
The fact is we need security but the big problem for the aviation industry is how to implement a security program without the current bunch of security parasites being involved, you can bet that any attempt to remove them and replace them a realistic system will be resisted tooth & nail as they see the easy money slipping from their grasp.