When Cane killed Abel his brother on the basis that his sacrifice was accepted by God and his rejected, God punished him (No body killed him in return). The penalty was severe that Cane confessed that it was too much for him to bear. But what do we see today for every wrong doing against one another?
The situation in Benue state of our country today is calling for a redress. How do we tackle it?
Because if we fail to proffer the lasting solutions it requires the fire of hatred and vengeance already kindled could take ages, generations to quench, if it could be quenchable.
To the question in your title, my Magic 8-Ball says:
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I think "thou shall not kill" is in the same book you got the Cane and Abel story. So if you believe that book, it is actually clear that you are not supposed to kill.
Also you talk about death as a punishment. Death cannot be a punishment since we all die. A person who might act as a benevolent angel dies, as well as the worst criminal. Then how can it be a punishment?
I think it might be one of the biggest challenges to a man who is born to a violent environment. But since you are questioning, I think the answer is clear. No matter what, do not kill, we all live and die, but we are not all killers and murderers. Chose wisely.
To your question as to how to tackle it. My logic says you have to learn how to look at the problem at your hand by trying to see the world through the eyes of your adversary. Most violent acts are promoted by a third party who is going to gain from the conflict. You are going to have to explain that there is much more to gain by having peace, than having war. Good luck!!!