The difference between cattle and humans is that humans can consent to having blood taken from them. It is far more likely to create a world where obligate carnivores can live alongside their sapient prey peacefully and justly than it is to create a world where omnivores peacefully and justly prey (unnecessarily, I might add) on non-sapient animals. That is, of course, because the latter world cannot be created at all.
The difference between cattle and humans is that humans can consent to having blood taken from them. It is far more likely to create a world where obligate carnivores can live alongside their sapient prey peacefully and justly than it is to create a world where omnivores peacefully and justly prey (unnecessarily, I might add) on non-sapient animals. That is, of course, because the latter world cannot be created at all.