This is a linkpost for https://atheistkit.wordpress.com/ethics/
I don't know. I wonder if some extra visualization would help.
Would you help catch the children so that their parents could eat them? If they pleaded with you, would you really think "if you were to live, you would one day agree this was good, therefore it is good, even though you don't currently believe it to be?"
Why say the important desire is the one the child will one day have, instead of the one that the adult used to have?
I would certainly be less interested in aliens obtaining what is good for them, than in humans obtaining what is good for them. However, that said, the basic response (given Eliezer's stipulations), is yes, I would, and yes I would really think that.
The adult has not only changed his desire, he has changed his mind as well, and he has done that through a normal process of growing up. So (again given Eliezer's stipulations), it is just as reasonable to believe the adults here as it is to believe human adults. It is not a question of talking about whose desire is important, but whose opinion is correct.