Faith, in terms of belief that does not rest on logical proof or material evidence, is a good thing to have.
I have faith that all of this paranoia about terrorist attacks will pass. Although more people are likely to be killed, I also have faith that my family and friends will be spared. I can't spend my whole life in fear. There is a difference between taking precautions and being irrationally overprotective. I've heard that some people in our corporate office refuse to drink anything but bottled water and they are opening mail using gloves. At that point, I think the terrorists have won.