Come on SF. Killing is murder. That's it.
When ego is prominent in one's mind, he stops seeing the common life force in all beings.
Out of ego, he sees himself as the supreme and out of assistance, other beings who look like him as well.
It's murder if it's human, it's food if it's something else.
Yes. It's true that what is born will surely die.
But that doesn't mean become inhuman towards them.
When plants are torn off from their roots, they feel the pain too. As long as one considers himself the body and not realize his true self, he will forever be in pain.
But if there's an option to make to show gratitude towards a being whos giving us it's life, the least we can do is make its journey less painful.
As humans.
Death is inevitable but suffering isn't. We cannot stop the pathogens in our blood being killed by our WBCs.
But we can be mindful of our actions... That's what the bottomline of Buddhism is.