Ok, I'll amend my previous statement to be more specific; in a prisoner's dilemma where cooperating means both entities get warm fuzzies, and in warm fuzzies I include all my preferences (so if cooperating would result in 100 people dying and me getting 100 $ I'd count that as a net loss), and defecting while the other cooperates gets me more warm fuzzies but not over a certain limit (as a rule of thumb, less than double what I'd get for cooperating, although of course this goes by a case by case basis) and with both people defecting we get less warm fuzzies, then I'd cooperate