Here is my thinking on it. I don’t think that the purpose of punishing people is revenge; I don’t think the purpose is to make people happy that he was punished for hurting us; I think the purpose of punishing people is because we think it is justice and this the correct and proper thing to do.
I think that society decides that certain things are wrong and immoral. And if people do things which are wrong and immoral, it is right and moral that they should suffer punishment. I think this is natural law.
And to me, if a society doesn’t think that it has the moral imperative to punish moral crimes, then it is because they don’t really believe that the crimes are immoral. And when society refused to punish crimes, it demonstrates to the public that society does not consider the crime immoral.
Thus, I believe it is absolutely a moral imperative that ???? ?? ???? ???? ??? ????. And when society does not do so, it displays to everyone that it is not that bad to kill people. And that has an effect on society, and makes people more likely to kill.