To try to build a perfect intelligence system - one that will never miss a terrorist, that intercepts every dangerous e-mail - is an impossibility. We face skilled adversaries who are trying to deceive us. Hiding is often easier than finding. If people are often surprised to discover that their own spouses have been cheating on them, how could we expect governments to have a perfect understanding of what others are doing?
The problem isn't usually - or at least isn't only - too little information, but too much, most of it ambiguous, contradictory, or misleading. The blackboard is filled with dots, many of them false, and they can be connected in innumerable ways. Only with hindsight does the correct pattern leap out at us, and to fix what "broke" the last time around only guarantees you have solved yesterday's problem.
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