I agree that merely repeating terms like fairness isn't going to be enough. Instead, what I want to do is to move the discussion to those grounds, and have robust debates against postmodern critical theory on those grounds. For example, they might have their own definition of fairness, but I am confident that we will ultimately win the debate on the ground of fairness, because their 'justifications' for being unfair to some ('privileged') people are going to be unconvincing to most people who aren't already firm believers.