Minor note. Your choice of utilities makes a 50⁄50 mixture of Cooperate:Defect and Defect:Cooperate better than the Cooperate:Cooperate outcome. So Cooperate:Cooperate isnt on the pareto frontier.
Minor note. Your choice of utilities makes a 50⁄50 mixture of Cooperate:Defect and Defect:Cooperate better than the Cooperate:Cooperate outcome. So Cooperate:Cooperate isnt on the pareto frontier.