If you are ever near a farm with animals, there might be a higher chance of being killed by a pig, than a terrorist's (cowardly) weapon on an airplane.
While I normally agree with this mindset, and I am not paranoid, recent events have made me think that this stuff is closer to home than I originally thought.
I was PIC on one of the aircraft last week where the box cutters etc. were found. Odds were better on 9/11 that (4 aircraft instead of 2) terrorists would be on board than they were on friday, yet, it happened to me.