anon85 comments on A few misconceptions surrounding Roko's basilisk - Less Wrong Discussion
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If I can do this, then my clone and I can do different things. In that case, I can't be guaranteed that if I cooperate, my clone will too (because my decision might have depended on which side of the room I'm on). But I agree that the cloning situation is strange, and that I might cooperate if I'm actually faced with it (though I'm quite sure that I never will).
How do you know if people have "similar" code to you? See, I'm anonymous on this forum, but in real life, I might pretend to believe in TDT and pretend to have code that's "similar" to people around me (whatever that means - code similarity is not well-defined). So you might know me in real life. If so, presumably you'd cooperate if we played a PD, because you'd believe our code is similar. But I will defect (if it's a one-time game). My strategy seems strictly superior to yours - I always get more utility in one-shot PDs.
I would cooperate with you if I couldn't distinguish my code from yours, even if there might be minor differences, even in a one-shot case, because the best guess I would have of what you would do is that you would do the same thing that I do.
But since you're making it clear that your code is quite different, and in a particular way, I would defect against you.
You don't know who I am! I'm anonymous! Whoever you'd cooperate with, I might be that person (remember, in real life I pretend to have a completely different philosophy on this matter). Unless you defect against ALL HUMANS, you risk cooperating when facing me, since you don't know what my disguise will be.
I will take that chance into account. Fortunately it is a low one and should hardly be a reason to defect against all humans.
Cool, so in conclusion, if we met in real life and played a one-shot PD, you'd (probably) cooperate and I'd defect. My strategy seems superior.
And yet I somehow find myself more inclined to engage in PD-like interactions with entirelyuseless than with your good self.
Oh, yes, me too. I want to engage in one-shot PD games with entirelyuseless (as opposed to other people), because he or she will give me free utility if I sell myself right. I wouldn't want to play one-shot PDs against myself, in the same way that I wouldn't want to play chess against Kasparov.
By the way, note that I usually cooperate in repeated PD games, and most real-life PDs are repeated games. In addition, my utility function takes other people into consideration; I would not screw people over for small personal gains, because I care about their happiness. In other words, defecting in one-shot PDs is entirely consistent with being a decent human being.