tim: How could they not be able to distinguish between the concept of good and the concept of baby eating if they understand that survival is good

What good is life without eating babies? How can you not understand that tribal loyalty is good?

I'm afraid I don't understand. By "not a babyeating thing", do you mean that the Babyeaters (unlike us) use the same term/concept for the 'separable essence of goodness' as they do for one particular terminal value? Or do you just mean that convincing them not to eat babies would be analogous, and analogously hard, to convincing humans to eat babies?

Oh, yeah, great story.