Yes, I also thought about the crew members who refused to take part after being exposed to the intelligence. However, I took them as plot devices, since I think they are there to make the inhumanity of the leader (who in turn represents humanity - or perhaps plutocrats since it is a person in power) even more terrible. Now that I think about it, it makes more sense to read it as the leader being a representative for those making decisions on others' behalf. I also buy your idea of questioning diet morality, but I see it as a part of something else. The crew has the option of turning down this meal, but they don't really have the option of doing it for the rest of the journey, as they will be lacking food otherwise. That was, after all, the premise for killing the wub to begin with.