Well, let me interrupt, Mark. I don't know if you have kids, but there are kids in your life somewhere. You want to protect them from bad people. If there were a possibility that terrorists would come in, you would be advocating, I'm sure, for ways in which we would keep terrorists from our shores.
As a professor in public policy, you must agree that not all our policies are acceptable to all people all the time, and certainly you will be able to cite cases where they fail us—as you have—but you still need policies. You still need concrete, practical ways.