In some cultures, this model of behavior still exists, and many people believe that this concept is above the written lows. But as expel in Monte Negro, they call it blood revenge. Of somebody bring harm to your family the is your duty to revenge but then is keep on going until the whole family become destroyed. In my opinion, if we accept this concept, then we are much worst the animals, animals kill to survive. It always better to develop qualities like humility and forgives then revenge.