My biggest concern with all of the planning that goes on with regard to counter-terrorism is how the U.S. can possibly be thorough with a country this size. So many things are happening at one time, just in a city. We can be paranoid and think the guy with the knit cap, sunglasses and fatigues is a terrorist, but he may be just another guy—someone's brother or father or son. There seem to be too many gaps: ways people can sneak through the cracks and avoid detection. We have no way of really knowing how many attempts are made, how many terrorist cells are wiped out or how many botched attempts may account for a number of "incidents" that are never reported to the public. And that's fine, I guess, for what would knowing do?
I just cannot conceptualize how we can cover so much ground and so many people. Terrorists don't wear signs saying, "Here I am." When people start carrying on about how many people leave Mexico and come into the US in California, etc., how can we possibly imagine we'll ever get a handle on terrorism as things stand? I don't have the answers, but I believe much more money and man-power would have to be in place throughout the nation to really tighten things up. I don't mean to be cynical. It simply seems a question of challenges vs. assets (personnel, money, etc.).