So the "possibility" of something bigger happening completely justifies tyrannical martial law, in your opinion? Since when does a police state protect against terrorist attacks? The mere chance of there being another attack does not justify doing away with rights time after time until we have nothing left just so we can MAYBE stop a terrorist attack that is MAYBE going to happen with our forces that are MAYBE more effective than any other search or manhunt. The idea that relinquishing liberty to a tyrannical government ever increases your security is questionable at best. A society that ever expects to keeps its sanity and its freedoms cannot have a bunch of exceptions allowing complete martial law to rule supreme whenever an attack is merely suspected. Besides, what did you think they were going to do with the guy after they caught him to prevent another attack? Send him straight to the torture chambers without a trial?