"there's no trait in animals that if true in humans would make it okay to murder humans."
Givin the chance, animals eat other animals. If I had to worry about a chance of someone eating someone else I think it would be ok to murder that person.
Your trait works if someone is attacking you. Self-defense. If an animal was attacking you, then kill the animal.
But cows, chickens, and pigs aren't attacking you
No, but they will eat each other, so why shouldn't I eat them?
Because morality isn't based on the actions of animals.
Many animals practice infanticide, is infanticide moral?
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