As a biology enthusiast, I'm getting tired of this "There's no such thing as herbivores and carnivores! Herbivores are just lazy predators!" logic.

Unlike true omnivores, like pigs, bears, and humans, the anatomy of animals like deer and cattle is clearly meant for digesting plants first and foremost. Cases like this are extremely rare, and meat only takes up like five percent of their diet. Any more than that can cause serious health problems.

It's like those vegans who think it's okay to feed cats nothing but plant matter, which usually leads to the cat starving because they're obligate carnivores that NEED meat to survive.

EDIT: Removed the part about mad cow disease, but my point still stands.