Err, the point of having a decision theory that makes you go to war against extortionists is not to have war, but to have no extortionists. Of course you only want to do that against potential extortionists who can be "dissuaded". Suffice it to say that the problem is not entirely solved, but the point is that it's too early to say "let's not care about simulated torture because otherwise we'll have to give in to extortion" given that we seem to have decision theory approaches that still show promise of solving such problems without having to change our values.