> Saying "we don't think law permits X" should damned well mean "we don't do X", though. I understand that it can eliminate possibilities. But my argument is t

> Saying "we don't think law permits X" should damned well mean "we don't do X", though. I understand that it can eliminate possibilities. But my argument is that it won't confirm that the US engages in certain activities. The latter would probably be much more harmful. And it's not as if enemies can intuit what we are doing by process of elimination. The only things they can eliminate by studying the law are those things that are illegal. That still leaves open the truly vast number of lawful strategic possibilities. Thus, enemies are not likely to be able to guess our moves just because a handful of things are precluded by law. With respect to your chess analogy, the set of possible and reasonable moves is much smaller. So yes, knowing that an artificial limitation is imposed on your opponent's moves would be very helpful in a chess game, where players generally only have a handful of reasonable moves per turn. But that's why it's not a proper analogy for something like counterterrorism strategy. And thus, I do think the harm to US interests would be negligible. We probably face a much greater risk by, for example, publishing the layouts of our streets and the names of our elected representatives than by publishing legal opinions. Street layouts can be used to plan terrorist attacks and invasions; the names of elected officials are a key ingredient to assassination attempts. Yet nobody has any qualms about publishing these things, and rightly so.