Jeff Robinson
Marxist-Lentilist: Jackboots and Jackfruit
I said on another thread recently that, for me, the thing which distinguishes humans from other animals is that we have the capacity to make moral choices and they don't.
So if the alien species was also capable of moral choice*, I guess I'd have to say that eating it, or exploiting it it any other way, was not morally OK.
There are lots of other reasons - nutritional, aethetic, not having a suitable recipe, etc - why I probably wouldn't eat an alien unless I was really desperate.
*it might be difficult to decide that, of course. If they'd managed to travel across space to find us, I might just give them the benefit of the doubt.
Leaving aside the point that not all human beings have the capacity to make moral choices and that some non-human animals do have such capacities, I've always found the assertion that it is moral agency that provides the basis for the possession of moral rights to be rather strange. Moral agency provides the basis for the imposition of moral duties but it does not ground moral rights. Infants, the insane and the comatosed lack moral agency but they are still the subjects of moral rights. If an adult of sound mind murders a baby and then claims he was entitled to on the basis that he possesses moral agency and the baby doesn't then, well, it's just self-evidently wrong isn't it? Alternatively, if an insane person or a small child commits what would otherwise have been a crime against another, they are not held to be guilty for that crime because of their lack of capacity. In relation to non-human animals, it seems to me that to the extent that humans do possess moral reasoning capacities that non-human animals lack, then this points to the fact that we might owe those animals moral duties that they do not owe towards humans or to each other.
I take the Peter Singer line on this - it is not whether they can reason or whether they can communicate, but whether they can suffer that makes the critical difference.
The Singer position is at least a coherent position to adopt, but there are two things worth bearing mind. The first is that on Singer's own account it should lead you close to veganism under present conditions. For Singer, who's been working on animal related ethics for decades now, the suffering imposed on animals for human consumption is so vastly greater than the pleasure that humans derive from it that we should give up most animal food sources. Secondly, Singer's position on animals is consistent with his utilitarian ethics that he applies equally to human beings. To avoid the charge of speciesism that you raised, you'd also have to adopt a consistent utilitarian ethics to both human and non-human animals. That may well be your position, but it's a controversial one that's subject to a number of powerful critiques.