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nshepperd comments on Causal decision theory is unsatisfactory - Less Wrong
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Only if the adversary makes its decision to attempt extortion regardless of the probability of success. In the usual case, the winning move is to ignore extortion, thereby retroactively making extortion pointless and preventing it from happening in the first place. (Which is of course a strategy unavailable to CDT, who always gives in to one-shot extortion.)
And thereby the extortioner's optimal strategy is to extort independently of the probably of success. Actually, this is probably true is a lot of real cases (say ransomware) where the extortioner cannot actually ascertain the probably of success ahead of time.
That strategy is optimal if and only if the probably of success was reasonably high after all. Otoh, if you put an unconditional extortioner in an environment mostly populated by decision theories that refuse extortion, then the extortioner will start a war and end up on the losing side.
Yes. And likewise if you put an unconditional extortion-refuser in an environment populated by unconditional extortionists.