I disagree completely. You cannot base a justice system on emotion, it is unfair to the victims(because the state sanctions that they can become murderers while they're in an emotionally unstable situation, which they might come to regret later), and it is unfair to the culprit(because different families might choose different punishment, which could result in a great variety of punishments for the same crime).
Besides, punishment and revenge mentality really doesn't have any place in modern society. There are, IMO, 2 main purposes of "punishment" by state:
1. Keep society secure(ie: Lock 'em up)
2. Try to make the culprit fit to return to society(psychological treatment, etc...)
Torture and death achieves none of this, and should never be sanctioned by the state. It should never be an independent goal to punish people, even if the people violated might feel that way.