People have a real hard time separating Omnivores from Carnivores and Carnivores from Herbivores.

I suggest reading "The Nature of Predators"

Great learning tool for such things imo. The backbone of the story is those distinctions and their societal impacts. Vegans will hate it tho. As the BBEGs of the story use corruption, exploitation, coercion, genetic engineering, social engineering, and war to force omnivores and obligate carnivores to be obligate herbivores.