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SilasBarta comments on Artificial Addition - Less Wrong
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Um, this sounds not correct. The assassin causes the bodyguard to add the antidote; if the bodyguard hadn't seen the assassin do it, he wouldn't have so added. So if you compute the counterfactual the Pearlian way, manipulating the assassin changes the bodyguard's action as well, since the bodyguard causally descends from the assassin.
Right -- and according to Pearl's causal beam method, you would first note that the guard sustains the coffee's (non)deadliness-state against the assassin's action, which ultimately makes you deem the guard the cause of the king's survival.