P.G.
I was in NYC on 9/11 and was evacuated from my building. Also evacuated a few days later when some jerk called in a threat to the city. I refuse to live in fear. More often than not, these types of call in things are hoaxes or incredibly short-sighted "kids" thinking they're going to get the day off.
Our child's school takes precautions, but considering that just regular life things like driving are significantly more likely to be dangerous, I choose to not let fear generated by highly publicized tragedies screw up my life.