Take a look in the mirror: Notice how your eyes are on the front of your head, and see those pointy teeth in the front corner of your mouth? We're designed as predators, not prey. That makes us at least partially carnivorous.
Now, do most of us eat way more than we need, sure, but that's not only true of meat, most of us eat way too much of everything!
The crazy thing is, you can be a Vegetarian and agree with that. There's many different reasons people consider the veggie route.
My reason had nothing to do with our natural role in nature.