Argument: Humans are obligated to cause animals no pain or suffering
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Jeremy Bentham - "The question is not, 'Can they reason?' nor, 'Can they talk?' but rather, 'Can they suffer?'"
Mark Twain, What Is Man, 1906 - "The fact that man knows right from wrong proves his intellectual superiority to the other creatures; but the fact that he can do wrong proves his moral inferiority to any creatures that cannot."