I travel a lot. Hey I am in BKK at the moment. I have been through hundreds of security checkpoint. I wear almost the same type clothes ie shirt and long pants and New Balance runners and a belt every time I travel.
Some places the belt lights up the sensors - others it does not. Once even a piece of steel in the shoes lit up the sensors.
So wow, they caught my shoes !!!
Traveling in and out of AUS we have plastic cutlery. Not even domestic travel in the US has plastic cutlery (unless you are in coach). Traveling out of the UK and Asia (where most of the terrorist reside) you have steel cutlery. Who are we trying to kid ?
Security seems to forget that on a plane there is so much steel, metal and glass that could be used by a terrorist. This is what is really frightening. You are right - most terrorist are pretty dumb - they haven't figured this out yet.
If someone with half a brain wanted is to hijack a plane the forks, palstic knives, wine bottles, soft drink cans etc etc are far more dangerous than any pair of nail clippers - yet we confiscate the nail clippers !!!
Airline security is simply a joke. There is no such thing. and this is what is really frightening.