No one is perfect. No matter how specific you make rules and regulations people will see them how they want to. It's not a dumb rule to ask that Security be able to see the true you.

There are more things then just bombs that a person can strap to themselfs that are going to slow down the screening of passangers. Here is a easy one. I have seen several times where someone was asked to remove a loose fitting garmet.

You take you "jacket", "hoody", etc off guess what the screener can now see that you forgot to take your cell phone off your belt. YES, cell phones have metal. You forgot to take that can of chew out of your back pocket (Copenhagen has a metal bottom on it), you have one of those stupid metal belts on, or one of a hundred things that you would totaly have forgoten that would have sent you into secondary screening.

More then just safety, it is a great tool to get people through faster. I love the rule, and would rather take something off, be done, and on the plane while someone else is still arguing or asking for a supervisor.