> In the same way, you could justify birthing a human into slavery, birthing a dog for dog fighting, birthing a bull for bullfighting etc. - it's not a good rea

> In the same way, you could justify birthing a human into slavery, birthing a dog for dog fighting, birthing a bull for bullfighting etc. - it's not a good reason. You misread. The premise is that they will live a good life, whatever that means for the species in question. > There's animals related to farm bred cows, pigs and chickens in the wild as well. You could use the land that's used for animal agriculture to let wild animals thrive, instead of birthing animals into a miserable life. Life in nature is rather miserable. I'm talking about better life than nature would afford. Would it be better for those lives to have existed, or not? It's a philosophical question, there's no "correct" answer.