I am pretty sure, If the animal is not forced to eating meat and the meat was not produced and manufactured unnaturally like it is for human consumption.
I suspect because same reason certain people have a problem with rapist and murders. It involves unnecessary hate and cruelty. Not all *have a problem* but if they did that would be it as well as their ignorance.
First of all we do not need to eat animals for survival, most people eat it for pleasure only. Humans cannot process meat and dairy well, that is why humans get sick, die, diseases and other health problem from consuming it. Also, since humans produce and manufacture animals, it is destroying our environment and causes world hunger. If you ever go to a slaughterhouse, and etc, you would see the unnaturalness and cruelty that goes on there. And humans can't eat the animal natural, with just are hands and teeth because we weren't designed that way. If somehow we manage we won't be able to digest the meat. Then I also highly doubt we would go in nature rape a female cow then suck her milk out of her, again animal milk isn't made for humans so therefore problems array. Animals have families, people fail to realize this
Certain animals eating others= natural, necessity for survival, easy to process.
Humans eating others= unnatural, unnescary for survival, not easy to process, damaging to their bodies, and the environment.