The "appearance" isn't at issue. The question of capturing some phenomena conventionally characterized as normative (usually by philosophers who want to maintain a strict fact-value dichotomy) is of empirical interest. The positive content of "theft", "fraud" and "economic injustice" can be captured within game theory in repeated games, specifically in repeated asymmetric zero-sum games. The vocabulary is standard in the literature, even if game theorists tend to ignore such questions. My motive is to suggest, pace economists and philosophers who insist that such notions ought to be excluded from positive economics altogether, that they do contain significant positive economic content and I intend to say what that is.