I don't
hate PETA specifically. Nor do I hate vegetarians (though I have been known to mention that "salad is what food eats").
However, if you look at evolution (and general zoology) you'll find that vegetarian animals all have enormous "guts" compared to meat-eaters; they need it to be able to digest all the plant matter. By eating meat (as a species) we were able to make a trade: lose the big gut, freeing up the energy for a....
That's right folks, a BIG BRAIN.
Just think; a few more generations of "grazers" and who knows what they'll look like.
<shrug> Hey, I didn't make the rule, I just eat meat to stay on the predator side of it... </shrug>