Robert Aumann Quote
The strong equilibrium point f just described is one of "unrelenting ferocity" against offenders. It exhibits a zeal for meting out justice that is entirely oblivious to the sometimes dire consequences to oneself or to the other faitheful——i. e., those who have not deviated.
"Acceptable Points in General Cooperative n-Person Games," in Contributions to the Theory of Games IV, Annals of Mathematics Study 40, edited by A. W. Tucker and R. D. Luce, Princeton University Press, 1959, pp. 287-324.