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Is the cooperating prisoner (in the prisoner's dilemma) being altruistic?

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Read my post on clarity. First off, there's not a/one "cooperating prisoner" in the prisoner's dilemma. There are two prisoners and four possible outcomes based upon each prisoner's choice of whether to cooperate. Second, even if you discuss the situation in terms of both prisoners and all four possibilities, it does not provide a counter-argument to Utilitarianism.

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I read your post on Clarity... and liked it. But, I'm unclear as to what you are saying in this post.

I am saying that cooperating increases personal happiness, and the total happiness of those involved -- so it doesn't require altruism.