How did proslavery theorists counteract the indictment of slavery as a moral wrong?

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Proslavery theorists argued that slavery was a more humane system than wage labor because slaves were provided with basic necessities such as food, shelter, and medical care, while wage laborers faced the harsh realities of competition and exploitation in the free market. They also contended that slaves were well-cared for by their masters and that the relationship between master and slave was akin to that of a family. This argument was aimed at countering the growing moral opposition to slavery in the North and in Europe.

How Did Proslavery Theorists Counteract the Indictment of Slavery as a Moral