That seems to be confused reasoning. “Cooperate” and “defect” are labels we apply to a 2x2 matrix sometimes, and applying those labels changes the payouts.
Not sure I follow your main point, but I was talking about actual PD, which I’ve now clarified in the original post. See also my post on What counts as defection?.
Not sure I follow your main point, but I was talking about actual PD, which I’ve now clarified in the original post. See also my post on What counts as defection?.