These guys are sending a message that absolutely no American is safe anywhere.
They can kill you while you're pumping gas, washing your car, mowing your lawn, going to school, shopping at Michael's, waiting for the bus, etc..
You can't protect yourself by staying out of nightclubs, federal buildings or by not flying.
Stay home and they'll come and shoot you on your own lawn or driveway.
Any American can be shot to death at any time. Age, gender, race, religion, social status, employment has nothing to do with it.
That's the definition of terror.
Another possibility is that somebody who is against our war on terror was inspired by the little information reported to the public about the tape...and came up with this "psycho sniper" thing.
There's a good chance the person we're looking for is not white.