alt Hacker NewsTo be fair, it doesn't really seem worth mentioning to say humans are inherently biased against murder, which we then agree is a killing against that society's norms. Because the definitions of "murder" vary so hugely, you're essentially just saying "there is a taboo against breaking the arbitrary rules of your social group."
No. What we are saying is that murder is a universal taboo. That the "arbitrary rules" of every social group on earth regulate killing demonstrates exactly that. It is precisely these rules that demonstrate universality. Some societies regulate what you can eat - halal/kosher. Most don't. Thus, there is no universal taboo against "unlawful eating".