could there then also be benefits of slavery of the few (millions) for the benefit of the many (billions)? - Vander
That is the ethics of Yahweh not those of a post-enlightenment society.
Morality does not reduce to arithmetic. A world where universal human rights are respected represents a higher peak in the moral landscape than one where the weak can be enslaved.
It does remind me a little of Sam Harris's railway carriage issue: Is it right to pull a lever and cause a runaway carriage to kill 1 railway worker vs 5 on another track? - Simon
I have always answered no to that dilemma. I would not kill one to save 5. The victim cannot be used as a commodity without their consent.