I'm wondering, what perspective does philosophy add to game theory? All of the philosophical musings at the beginning of the article seem to describe what "moral" beings should do. This seems unrelated to what "rational" agents must do, which is one of the simpler questions of game theory. Do philosophical arguments guide, for example, how one might design utility functions? I have studied enough game theory and attended enough conferences and his hasn't showed up except to argue that a definition is perhaps reasonable (and then we wait for the elegant algorithm/analysis punchline anyway).