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Yes, slavery can be a pro-social, eugenic, mutually beneficial institution, if it is done correctly. Only the unthinking man is reflexively anti-slavery:
>“We know the social condition of England would be infinitely better if the lowest laboring class were domestic slaves; for masters are always present, and infinitely more humane and generous than the overseers of the poor-houses. The whole weight of society falls upon the most feeble, indigent, weak, and ignorant laboring class. They are taxed alike by skill and capital. They are not only slaves alone to the property-holders, but slaves to lease-holders, professional men, merchants, artists, mechanics, in fact they are slaves to all above them; for all above them exploitate or tax them by exchanging a small amount of skilful labor for a large amount of common labor.”
– George Fitzhugh, Wealth and Poverty-Luxury and Economy

>those who are as different [from other men] as the soul from the body or man from beast—and they are in this state if their work is the use of the body, and if this is the best that can come from them—are slaves by nature. For them it is better to be ruled in accordance with this sort of rule, if such is the case for the other things mentioned.
– Aristotle