> [2] To preempt the inevitable petty drive-by pedant, I define "human" as any animal with these two properties, so according to this view, an intelligent alien from another planet would also be human, despite occupying a place in a separate phylogenetic tree or whatever.
Your alien might have some 3rd property that you do not, and thus may farm you.
A future AI that can produce and consume the sum total of all recorded human knowledge within the amount of time that you have a single thought will likely have many emergent properties that you do not, and thus may farm you as well.
> Indeed, it usually rests on sentiment or convention rather than a sound and rationally grounded objective ethics.
Your whole argument rests on sentiment and convention, and would have been summarily rejected by the slave owner based on his own.
Your alien might have some 3rd property that you do not, and thus may farm you.
A future AI that can produce and consume the sum total of all recorded human knowledge within the amount of time that you have a single thought will likely have many emergent properties that you do not, and thus may farm you as well.
> Indeed, it usually rests on sentiment or convention rather than a sound and rationally grounded objective ethics.
Your whole argument rests on sentiment and convention, and would have been summarily rejected by the slave owner based on his own.