I would submit that in the everlasting American attempt to balance liberty with security, there are times such as extended periods of relative peace that security must be emphasized lest we upset the balance.
This situation is just the opposite. In this climate of knee-jerk reactionism when emotions run high (and I admit to being peronally guilty of this myself), it is imperative that we emphasize liberty in order that it not be lost.
There was a Denzel Washington/Bruce Willis movie about terrorism in New York a couple years ago that made this point rather eloquently, I thought.