V_V comments on Voting is like donating thousands of dollars to charity - Less Wrong
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As soon as you're talking about communities, you're talking about meta-PD, not PD, and as I've explained above, rationalist agents play meta-PD by making sure cooperation is desirable for the individuum as well, so they win. End of story.
Nitpick: Superrationality is not a decision theory.
Wikipedia is not a determinative source.
Which answer is the "superrational" one in Newcomb's problem? In a game of chicken? In an ultimatum game?
Decision theories like Causal Decision Theory and Evidential Decision theory have answers, and can explain why they reached those answers. As far as I am aware, there's no equivalent formalization of "superrationality." Until such a formalization exists, it is misleading in this type of discussion to call "superrationality" a decision theory.
And let the other guy win? Madness!