Not everything is preventable, but there are such things as "reasonable possibilities". In addition, this particular thread is about a non-specific legislative bill that covers a wide range of computer crime that could fit under the term "terrorism". Would it be better if a crime that satisfied the elements of this bill were to go unpunished completely because there was nothing to address a crime of that magnitude? You can't punish someone for an act that doesn't violate a specific statute. I understand your concern for excessive legislation and the appearance of wasted tax dollars, thesecretfire, but I don't believe that any statute currently exists to satisfy large-scale acts of cyber-terrorism.