First of all, it is scientifically proved that humans are so smart because of our diet.
Secondly, if my only way of surviving was to kill another human, unless that other human was someone I love, I would do it. Human lives aren't as highly valued as most people picture them. I mean, sure, most people have families and friends who'll miss them, but can you say the world will miss them?
If there's a king who was good enough at his job as to grant the welfare of his people, would you take him out of his trhone because he killed a couple man? Of course you wouldn't, because it would perjudicate you.
So basically, what I'm trying to say is, human's lives are valuable depending on who you ask.
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