Notice how you had to assume the altruist to have the extraordinary degree of intelligence and rationality to calculate the best possible wish and Stephen merely had to assume that the selfishness was of the goodwill-toward-men-if-it-doesn’t-cost-me-anything sort? When you require less implausible assumptions to render a given ethical philosophy genie-resilient, the philosophy is more genie-resilient.
Notice how you had to assume the altruist to have the extraordinary degree of intelligence and rationality to calculate the best possible wish and Stephen merely had to assume that the selfishness was of the goodwill-toward-men-if-it-doesn’t-cost-me-anything sort? When you require less implausible assumptions to render a given ethical philosophy genie-resilient, the philosophy is more genie-resilient.