EIDW: Some chap, a nutjob - we can agree - strolls into the unsecured side of the terminal claiming to hold an explosive. The airport is evacuated. Aircraft are told to wait, with the doors shut. Airport unusable for a couple of hours. A fair bit of economic damage, plenty of terrified punters, and next we'll have the war-cries for increased security. You call this a civilised society? I call it something else.
If one nutjob can achieve all this on his own, no amount of security will fix the problem. This is a problem which, if treated in the way it was today, will culminate in a seriously terrified and enslaved public.