If we did not exploit animals, we would not have society as we now know it. Does this fact not prove that animal use by humans is morally justified?
No. In the first place, the question assumes that we would not have devised alternatives to animal use if that were necessary either because nonhuman animals were not available or because we made a moral decision not to exploit them as resources. Second, even if animal use were necessary for society as we presently know […]
