I think this is a no-brainer.
P1. Suffering should be minimized. I think this premise is accepted by just about everyone.
P2. Killing animals causes them to suffer (I think things like "how do we know they suffer?" is silly. That's like asking "how do I know there are other minds?" Obviously, I don't KNOW it, but as long as people continue to act like they have minds, and as long as animals continue to act like they suffer, I will assume as a matter of practice that they do.)
C. Therefore, killing of animals should be minimized.
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