Revenge is immoral. It can never be just. Therefor vengeance makes any justice system unjust.
Tbn. without retribution the laws against criminality are just empty words. example:
Think of the law that has a thief pay seven times the value he stole. great idea.
The one who takes somebody else's life has forfeited the right to live.
" it is a fearful thing to fall into the hands of the living god."
"outside the liars and adulterers, the dogs"