Capital punishment promotes further vengeance, which is not a teaching in Christianity. Overcrowded prisons and the rise in crime call for more serious punishment for more severe crimes. Morality has been on the decline generation after generation. Acts of violence become less tolerable each generation. In order to support and protect citizens, whom refrain from vicious acts of terror, society must severely punish those who commit such acts.
Capital punishment sets examples of murders and wrongdoers.
This causes society as a whole to benefit greatly because of the absence of such criminals and the example set by them. The practical consideration of the possibility of error and unhealthy trauma as a child are important arguments against capital punishment. There is always a chance that the person convicted could be innocent. Taking life away from an innocent human being is completely unjustifiable. Just the slightest hint of innocence in a trail should cause abandonment of the idea of death penalty.