Basically what IZinterrogator is demonstrating is that, no matter what policies you implement, there will always be ways to counter them. Which means that any policy you want to implement must be viewed in terms of additional security offered versus liberties infringed.
We've long since passed the point of diminishing returns. At this point each new restriction put in place does very little to actually reduce my chance of dying a fiery death, regardless of how warm and/or fuzzy it may make you feel.
At some point you have to accept the very real statistical probability that you may come to a violent end. And honestly, if terrorism is something you really worry about all that much then I'd suggest that you're either somebody too scared to go outside in the morning or somebody who has a terribly skewed view of how likely you actually are to be killed by a terrorist attack (even without the no-fly/watch list). Not to belittle the loss of those who did die or lose somebody on 9/11/2001, but in the grand scheme of things terrorism is way down there on the list of unexpected ways you could die. Even counting the 3,000 dead that day.
Over the last decade or so, what were your actual odds of dying in a terrorist attack? Compared to, say, your odds of dying in a car accident, fall, shooting, etc? Yeah, exactly. Pretty low. Unless you're the kind of person who looks up for falling pianos as they walk down the street, there's really very little reason to worry about dying from a terrorist attack. But for whatever reason people are just unable to grasp how unlikely they are to become a victim...random violence just messes with people. Which is why, for instance, thirteen people shot in a metro area of over five million can have an entire city cowering in fear.
Me? For whatever reason (perhaps because I've had people try to kill me), I figure I die when I die. I don't wonder every time I get on a plane if it's going to crash, or if some crazy purse-bomber is going to take us all with her. It's possible, sure, but come on. Why live your life in fear?
I'm not saying we should do nothing to stop terrorism. I'm saying that, again, anything we do must have the positives realistically weighed against the negatives. One could argue that, to a large extent, the airport is the absolute last line of security...if a guy makes it to the airport, then about ten other levels of defense have failed. Realistically, he should have been arrested long before he made it to the ticket counter or security checkpoint. If you think somebody who has evaded capture and managed to bring their plan that far is likely to be foiled by a list of names, then I've got a Magical Umbrella of Falling-Piano Protection(TM) to sell you...cheap.