Simply, I would say this in response: animals in the wild eat other animals in order to survive. Many humans, on the other hand, eat animals for reasons other than survival, such as taste and pleasure. It is okay for wild animals to eat other animals because they must do so to live. On the contrary, many human beings can live healthy lives without eating animals. There lies the difference.
Note: Often times, this argument is followed by something like "So would you eat animals or other humans in order to survive?" The short answer is, of course, people do many things they wouldn't do under normal circumstances to survive. Not only would many people--including vegans--eat an animal if they were put in a situation where they had to survive, but a lot of people would also eat another human being if their survival depended on it.
Adam Kochanowicz of Vegan.FM argues the following:
Some claim it’s wrong to eat other animals yet other animals do exactly that in the wild. Is it really so wrong for us to kill animals for food when animals rely on this to survive in nature? After all, we are animals too.
When we deconstruct this question, there are several possible underlying arguments which are troublesome. Whatever the main argument is, there is an apparent appeal to nature fallacy here.
The appeal to nature fallacy:
- N is natural.
- Therefore, N is good or right.
- U is unnatural.
- Therefore, U is bad or wrong.
Indeed, animals kill and eat each other in the wild. However, they also do not experiment on other animals for medical research. This lack of experimentation has been happening for millions of years in the wild and surely the survival of wild animals has depended on this as harmful genes and weak individuals have been naturally selected out of populations. Yet most opponents of veganism would not object to medical animal experimentation, and indeed they would object to the objection of medical research on animals.
Indeed, species of dogs and cats are also subject to being hunted and eaten in the wild. Yet should we be silent about harming dogs and cats? Would the underlying logic of this question permit me to beat a golden retriever to death so I could eat her for dinner?
The person asking the question is also bound to explain why “wild animals” or “nature” are being used as sources of morality. Would we discuss moral issues of rape or murder within our own species based on the behavior of wild lions, boars, or birds? For some reason, the natural behavior of wild animals does not justify these actions when it comes to harming other humans. So why are we beginning with the premise that behaviors that exist in nature are morally justified for humans?
Furthermore, what does what we do to other animals have to do with “nature” or “the wild”? The animals we eat and are exploited as slaves, they are genetically modified* to exist as food animals for us. They are kept in controlled, closed areas free-range or otherwise, and are led into motor vehicles to be taken to buildings where they are killed by machines. Meanwhile, animal products are killing us and contribute to ischaemic heart disease–the number one natural killer of human beings. We do not need animal products to survive and, in the developed world, we can easily live healthfully on a vegan diet.
This question serves as an example of how the public will appeal to nature when it serves their interests (consuming animals for food, etc.) yet will appeal to their superiority over nature when it serves that very same interest (consuming animals for research, etc.) If we wish to acknowledge our natural, yet superior intellects, we can acknowledge our ability to feel empathy and make intelligent moral choices about how our decisions affect others.
*By the way, your “natural” animal product may not be genetically modified in a lab (although it probably is), but they are domesticated regardless. Their genetic makeup has been artificially selected over many years to be food animals for human beings.