I recognise your point, rudimentary social morality has been exhibited in other species, I have seen footage of great apes apparently showing compassion to members of its own social group, but have you ever seen any other creature consider a moral position on members of other species?
Yes Dogs with their human companions. I'm sure you have heard of many of the stories of dogs saving a human being in the case of seizures or even choking.
But by natural extension of the negative utilitarian argument you could justify cannablism, if the person being eaten wasn't aware of their imminent death, and didn't suffer greatly during the process of being killed...and eating the individual saves the other human days of a slow suffering death through starvation, it could be deemed moral... lol
You could but then you could argue that cannibalistic activity has an effect greater than the two parties involeved and that cannibalistic behavior is an impediment to the fostering of a socially cohesive society. From a negative utliitarian viewpoint one could say that cannibalism creates more harm because it harms society as well.
Then we would need to find a demarcation that isn't, or is less, arbitrary. I agree, using the ability to exhibit any moral outlook would seem to be arbitrary. Maybe altering my premise to state 'those capable of making the utilitarian moral decision to only cause suffering if that suffering alleviates a greater suffering'?
And that is exactly where I wanted to lead you. In my paper I argue that the only tenable demarcation to establish is within our own species. The reason for this is more about cannibalism we talked about earlier. Cannibalism has much stronger backing to be forbideen than the eating of any other organism because cannibalistic practices have more severe consequences.
To show this I will use the blending of two ethical ideas. First the categorical imperative and second negative utilitarianism.
First if we were to recommend cannibalism in any instance then we must accept that we are arguing in favor of a society that accepts cannibalism as per the categorical imperative.
Now we must consider the utilitarian merits of a cannibalistic society vs. a non-cannibalistic one. A cannibalist society creates more harm in that a society in which one has no reasonable level of assumed safety from being eaten by their neighbor inhibits the ability for man to form a cohesive society and cooperate amongst one another. Thus we could see that many of the things that create happiness and alleviate suffering in a society such as science, medicine and technology would be put in jeopardy and thus a cannibalistic society violates both postitive and negative utilitarianism.