Let's assume a purely materialistic view of reality. In such a system all truths will be defined from nature.
1) Animals in nature kill each other all the time for food and sport.
2) All eating after a certain cell count for a creature requires death in some way.
3) Death is inevitable; life is not.
4) Force is the determinate factor for making something happen.
5) The universe does not care for life or death. It is merely a thing. It too will die taking all life within it with it.
Construct a moral set from those points (add more if necessary). I contend that you can't seat any ethics on it except might makes right. Anything other than that is merely a personal preference with no justification outside of the amount of force one can apply.
As a result I see no distinction between what is food and what is friend. It is merely personal preference. Sentience does not provide any actual force. It might cause your force to act, but it does not, in and of itself, mean anything.
To get out a head of it since it's been bandied about: cannibalism is impractical because it leads to the destruction of society when applied to the general population. I did not say it's wrong, for it is only death, which as we've seen is just part of nature. I say it makes commerce and society difficult if applied internally as well as outwardly. We, as a society, have a preference for this stability. We, as a group of actors, have the ability to force this view by our combined strength such as police and other law enforcement institutions.
Of course, you have a valid point. But what you're ultimately arguing against is any form of moral reasoning.
While I find the theoretical discussion of morality interesting, I'm far more driven by the practical discussions. People generally accept a moral axiom, explicitly or implicitly, something along the lines of "Harming other individuals unnecessarily is wrong". If that is the case, I'm going to argue for the consistent application of that principle, which is also where sentience enters the conversation. If they don't hold a similar moral axiom (which I've found is fairly rare), then I don't really have any ground to stand on in this debate. I'm certainly not equipped, if it's even possible, to make a moral argument from first principles.
1) Animals in nature kill each other all the time for food and sport. 2) All eating after a certain cell count for a creature requires death in some way. 3) Death is inevitable; life is not. 4) Force is the determinate factor for making something happen. 5) The universe does not care for life or death. It is merely a thing. It too will die taking all life within it with it.
Construct a moral set from those points (add more if necessary). I contend that you can't seat any ethics on it except might makes right. Anything other than that is merely a personal preference with no justification outside of the amount of force one can apply.
As a result I see no distinction between what is food and what is friend. It is merely personal preference. Sentience does not provide any actual force. It might cause your force to act, but it does not, in and of itself, mean anything.
To get out a head of it since it's been bandied about: cannibalism is impractical because it leads to the destruction of society when applied to the general population. I did not say it's wrong, for it is only death, which as we've seen is just part of nature. I say it makes commerce and society difficult if applied internally as well as outwardly. We, as a society, have a preference for this stability. We, as a group of actors, have the ability to force this view by our combined strength such as police and other law enforcement institutions.