You simply don't value all life, if you do you die, because to survive you have to kill, other people, animals, plants, microorganisms that attack your body..
Sometimes there is no reason to kill someone who doesn't endanger your well being, even if that person endangers the well being of other people, that person sometimes might even turn out to be your friend.
Agreed on the armor. 
I would say that depends on your definition of "life." I didn't think it needed clarifying, but when I say "life," I mean sentient life. Humans, Dwarves, Elves, Qunari; these all fit the bill. Animals are a bit iffy in my book. As for your second paragraph, I'll be honest, I didn't understand what you were trying to infer.
And yes. That armor is damned awesome.