Biocentric, here!
Our laws regarding the murder of other humans is a preference around which sociocultural mores have formed. It's part of the "social contract," developed by tribal primates (humans) who realized that it was to their benefit to do so ("You don't kill me or mine; I won't kill you or yours."). Sadly, we haven't quite got the hang of it yet, which is why we still have everything from individual murder, to continuous, full-scale war.