That would sound strange if I didn't remember the reference. Not 'D' for defect. 'D' for zero based alphabetized listing of boolean 11 where 1 is 'C'. :)

I didn't like that comic because `D' can be achieved through a combination of egoism and UDT just as easily as through altruism. I assume that Weiner would not judge an egoist to be ethically perfect in the least convenient world, one where they were always forced to cooperate in prisoner's dilemma-type situations but could be entirely egoistic whenever they could get away with it, without even acausal consequences.