Answer this.

a thought came across my mind last night, when i was on the phone with the Love, half sleep.

man is considered an animal, correct? Animals by definition are:
1. An organized living being endowed with sensation and the power of voluntary motion, and also characterized by taking its food into an internal cavity or stomach for digestion; by giving carbonic acid to the air and taking oxygen in the process of respiration; and by increasing in motive power or active aggressive force with progress to maturity.

Animals are known to kill for protection, food, and territory.
So, why when we humans do it, it's a crime?

Not saying, I'm for murder, and killing sprees, and all that jazz, but seriously speaking.
We have primitive instincts still built into our DNA. Yes, we are more "civilized", we can stand upright, speak, but what does that really mean?
We kill for protection, we kill for food, we kill for territory. Is it wrong, because we should "know better"?
And then, on the other hand, what is exactly knowing better?
AND then on that same other hand, how can a human, judge another, by their actions, if we believe in God?
When you're in court, you pledge your oath to God, so shouldn't God be the one to judge? How can we replace that greater power?

I, honestly, don't know why this was on my mind, but every time I ask someone, the question just stumps them. I think, because no one really has the answer to it. How can there be an answer to that?
I think this is the question of the week. Hopefully, someone answers me.