Explain how this helps.
Seems to me that loss of our blood-won freedoms is a victory for the Al Qaida. Loss of freedom would extend no increase in safety or security. Besides, trading freedom for security causes loss of both.
I don't agree with it -- but our technology could certainly help better prevent an attack if our rights were restricted -- I don't doubt that some changes will be made. Easier surveilance. Possibly identity chips. When people talk about our open borders much of that could be done away with if we make it utterly impossible for someone to live in this country without an implanted id. The same security that secures our data could be used to secure our people. I see that as a question of when it will happen -- not if.
It would only "help" prevent though. Eventually a virus will make its way into a population. i.e. If they landed on the beech with a nuke in their suitcase and avoided every checkpoint till they made it to their target. Not much an id would do to prevent it.