Reminds me of the Morlocks & Eloi from The H.G. Wells novel "The Time Machine", except which are we, the ugly, brutish, carnivorous Morlocks or the beautiful Eloi that are farmed for their meat?
The reality is perhaps more disturbing, both pigs and people are omnivores, we occupied much the same ecological niche, indeed our biology is so similar that there's research being undertaken to make pig organs compatible for transplant, so it's not so much a matter of Morlocks and Eloi as it is Morlocks and Morlocks.