Manopolus
Metaphorical Anomaly
Yes, it certainly can be fallacious when appeals to nature are associated to nature in the first place.
It took decades to for society to move past social darwinism. The prevailing wisdom in the 1870s viewed humans as essentially another animal (correct), that natural selection and survival of the fittest shapes human populations (correct), that survival of the fittest and competition are a natural state of affairs in nature (correct) and should be applied social policy (wtf?). People took survival of the fittest as not only descriptive, but prescriptive, and used it to justify laissez-faire capitalism. Later it became connected to scientific racism, eugenics, fascism. What went wrong? Well, I'd say the interpretation of survival of the fittest as a prescriptive rule to guide social policy for a start.
In just about any discussion on homosexuality, someone will eventually remark on whether homosexuality is found in nature, whether animals can be exclusively attracted to members of the same sex, or that might even say "even goats know that a peepee goes inside a weewee". The correct response here isn't "here are a list of species where homosexuality is obsereved", but instead, that there's no inherent connection between something being "unnatural" and "wrong". I've never seen any other animals build skyscrapers, but that's not a rational criticism of human behavior, is it? If not, then what difference does it make whether non-human animals are homosexual? At the same time, some animals like lions are quite content to kill members of their own species, does that mean I can do the same thing? If not, then what does it matter that some behaviors or natural or not, what does that have to do with being ethical?
If you're making an argument that humans evolved to be omnivores, you need to explain what connection that has to animal rights. Additionally, you need to be prepared to handle obvious counter-arguments, like the fact that humans have been killing other humans for at least as long as they've been omnivores, tribalism is as much a part of our "nature" as being an omnivore.
I think I'm beginning to understand our disconnect here, at least to a degree. Perhaps I didn't explain my position quite cohesively enough. Your original partial quote does, indeed seem to be an argument of this type. However, the overall argument wasn't "because this is what nature made us to be" but rather "because having the option of eating meat/using animal products is beneficial to our survival." Both invoked nature, of course... but the second couldn't be construed to be an "appeal to nature" fallacy.
Circumstances tend to dictate ethics. Circumstances may seem appropriate now to give animals the rights of humans, but I wouldn't bet on it, and those circumstances might change. I'd prefer not to be out of the habit of knowing how to kill/butcher animals when/if a situation occurs which might make it a necessity. I do understand that most people are already bereft of this knowledge -- outside of going to a supermarket and buying meat, most don't know how to obtain it -- but it might be a good idea for some members of the human race to retain the skill. And how are we to do that without practicing it?
Should animals be treated as humanely as possible -- without sacrificing our own needs? Well, I wouldn't argue with that, but that's a long way from giving them the same rights as humans.
I suppose that doesn't quite answer the O.P. except in the consequences of it's practical applications. However, perhaps I simply think the O.P. asks the wrong question on the issue, thus tainting the answer. I prefer a different angle, since the question posed does not quite fit the way that I think. I don't tend to think much about right and wrong in the abstract sense anymore, though I did when I was younger. I tend to think more about what's right and wrong here and now in the present or in a given set of specific circumstances. Call me a relativist if you'd like... I won't deny it.
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