OneSheep:
When a person does something egregious, our conscience is triggered and we desire to punish.
Do you not recognize that sin deserves punishment? Yes, we should desire punishment because it is a matter of justice. It is sin and sin alone that deserves punishment. It is in fact an obligation of government to punish those who “does something egregious.”
While our religion tells us to forgive, the value of forgiveness is not upheld in our society.
The obligations of the state are very different from those of the individual. The individual is called on to forgive, but the state has a duty to punish even as that right is forbidden to the individual.
In short, we want to kill those who do great evil because it is our nature. What Jesus does is invite us to transcend our nature and forgive.
You either misunderstand the nature of justice or dismiss its importance. Nowhere in the gospels or in all of scripture is it suggested that one who sins does not deserved to be punished. Quite the opposite:
On the contrary, It is written (Isaiah 3:10:11): "Say to the just man that it is well; for he shall eat the fruit of his doings. Woe to the wicked unto evil; for the reward of his hands shall be given him. (Aquinas, ST I-II 21,3)