What exemplified for me the total stupidity of the security systems in place was when I flew GA into Bratislava last year. Imagine the scenario: I return to the GA terminal which is at least 300m away from the passenger terminal, a lone Pilot about to be escorted back to his Spam Can; my licence and paperwork are all in order, however security determines that my Swiss Army Knife, the bottle opener part of which I use to loosen the oil dipstick should the Incredible Hulk have tightened it down on the previous flight, could not be taken on board as it's a security risk.....
I asked the security guard what he thought I was going to do with the knife - slit my own throat? Did it not occur to him if I wanted to cause maximum damage, I could just point my Spam Can at a target on the ground and hey presto...
It's not the paranoia which gets me, it's the fact that people cannot THINK. Yes, there might be a rule for swiss army knives being taken on commercial aviation but I wasn't commercial aviation, I was the sole occupant of a spam can......
... what makes it all the more ridiculous is that at Geneva Airport you can BUY the same knife AFTER security......