Blank out the recommendations of these two philosophers
Actually, this is precisely what I object to. Humans are rationalizing animals: without careful training in actual reasoning, we make up reasons for the conclusions we want. If one man finds ostensibly prosocial reasons to be selfish and another ostensibly selfish reasons to be prosocial, I conclude that the one recommending altruism is much more likely to actually hold the door open for little old ladies, but has perhaps been taught to believe that “altruism is irrational” or some such nonsense.
Actually, this is precisely what I object to. Humans are rationalizing animals: without careful training in actual reasoning, we make up reasons for the conclusions we want. If one man finds ostensibly prosocial reasons to be selfish and another ostensibly selfish reasons to be prosocial, I conclude that the one recommending altruism is much more likely to actually hold the door open for little old ladies, but has perhaps been taught to believe that “altruism is irrational” or some such nonsense.