Why not? It's not like vegetarians just disagree out of principle.
And why exactly is it bullshit?
There is no "okay" in the animal world, there is no right or wrong. And carnivores serve a necessary purpose. I don't have a minimum intelligence requirement to respect something.
Best argument ever: animals do it so you can too!
Also when an animal kills it's usually for food, defense or a mistake. Only humans kill because they'd rather have meat than something vegetarian. So even if it made sense to compare humans with other animals it's still not valid since the reasons for killing are usually different. I have absolutely no problem with (for example) Amazonian tribes that eat meat because they have no alternatives and they live 'with' nature, not above it. They eat meat for survival, not simply enjoyment.