So I guess because a wolf can outrun a dear thanks to its superior endurance, and then tear it to pieces with its much stronger jaws and fangs, it's not a fair fight.
Also, beavers, bees, ants, birds... build structures. So do all animals that live in burrows. I guess they're "unnatural".
"Monkeys" are not vegetarian. Some are. Most aren't, and also eat animals. Some are even documented to engage in cannibalism -- chimpanzees, our closest ape relatives.
And even if it weren't like that, we're different species. Cetaceans are carnivores, even though they're most closely related to hippos, which are herbivores.