Very little can be done to protect the U.S. from another terrorist act. Yet when (not if) we get hit again it will all be GWs fault.
Our actions in the middle east today are sure to bring more terrorist acts here but I believe we would be in a much more dangerous situation now had we not gone in at all. This is much bigger than anyone percieved and I give GW kudos for having the balls to initiate a response knowing so many folks with their heads in the sand would complain. The reality is that the world will never be the same again - which is probably a good thing cause we never really had any real friends (except Britian) to begin with.
Oh and the whole dirty bomb thing, sure it's a reality but we can't live our lives in fear of the event. My line of work tells me we're in for a one frightening decade - 911 will look small.