No comparison between slavery and effects of carnivore diet

There is absolutely no way one can claim that there is parallel between slavery and being a carnivore. Sure, in both cases living creatures are kept against their will, and both try to silence their opposition through gag rules (the gag rule on discussing slavery in congress and the Ag Gag law that prevents people from filming inside factory farms), and both defend what they do as a positive good and claim that it would be more harmful for those held in captivity to be freed (or at least that the captives are treated benevolently and could not survive on their own). Oh, yes, and that it should be something that should be done away with gradually if at all. But, other than that, people that make that ignorant jump of logic have nothing to go on.