Do you not think the Government is aware of every existing anomaly in the system? Do you not think that every Minister with any sort of responsibility to Aviation Security has not tin platted his or her arse with a water tight Risk Assessment review, prepared by his or her senior staff, showing that all the likelihoods and consequences line up appropriately...and that all the appropriate controls are in place? These people may be dumb, but they're not stupid !
My feeling is that the latest changes are purely to placate the squeaky wheels...not to address a particular need.