accord to this film and you should never notify the fbi or other authority if you get a suspicious neighbor . not even if he look like a terrorist and have a chemistry lab and receive constant delivery from other suspicious look people . and especially not if you just lose your job and your wife just leave you . they will just think you be paranoid and put you in an asylum and even if it turn out in the end that you be right all along . this be one of the reason why terrorist have succeed so far . this be how they put the first bomb in wtc and carry through their second assault . this be how they make the bomb for the lockerbie accident and get it on board . people do not care and or be afraid of the unpleasantness to themselves if they notify the authority .