I think we had this discussion in other DP threads, but I’ll see if I can reiterate it clearly. First, I hold the following two things as true; if you disagree with either of these, then you won’t agree with my conclusion and we’ll just have to agree to disagree.
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We have certain rights, of which the right to life is the most valuable. In fact, because no other right has any meaning without the right to life (ie, what good is freedom of speech or property rights if you’re dead), I hold that the value of the right to life is more valuable than all other individual rights combined.
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Justice is an equitable forfeiture of the rights of the criminal when compared to the rights of of the victim that were violated. I specifically say equitable because it doesn’t necessarily have to be the same right; it’s purpose is to establish a balance, not a literal eye-for-an-eye approach. To generalize to modern society, we have agreed through tradition, law, and other means, that generally most crimes can equitably punished by through fines, a forfeiture of property, incarceration, a forfeiture of freedom, or both.
So, that said, I think this does a good job for accounting for virtually every crime. I think it’s also vastly preferable to the literal eye-for-an-eye approach because the purpose is to, in a sense, establish an equilibrium, thus an inhumane punishment like a beating, even if it is the direct eye-for-an-eye punishment can be foregone for something in line with modern values. Further, it allows us the opportunity to punish crimes that wouldn’t have a direct eye-for-an-eye punishment, like rape, kidnapping, theft, vandalism, etc. And, though it’s not directly relevant, this is also the reasoning why I don’t believe in so-called victimless crimes like drug usage.
Anyway, that does a great job in every case except one, which is murder. Because life is more valuable than the comibination of all other individual rights, it is impossible to assign an equitable finite fine and/or prison term; it’s not extraordinarily difficult, it’s impossible. As such, there remains only one suitable right that can be forfeited, and that’s the right to life of the criminal. Thus, in a case of murder, the only just punishment is the Death Penalty.
You also ask what benefit we realize from it? It’s not something that’s so easily quantified because, for me, it starts getting into philosophical areas. I believe that by not holding steady to the ideals of justice as a fundamental pillar of a stable society, that it has the potential to begin the unravellings of society. I’m not trying to make a slippery slope argument, but I would argue that a lack of dedication to justice in the specific case of murder, or any other case for that matter, is tantamount to a lack of dedication to justice as a whole.
Further, regardless of your religious beliefs (or lack there of), there’s a general concept of the golden rule, karma, “what goes around comes around”, in virtually every culture, and certainly present in ours. It’s a concept that encompasses a natural sense of balance, and it always encorporates a sense of balance such that if you do evil deeds, it will come back to you. I envision justice as very much the same way and that it is a fundamental responsibility of society to maintain that balance, and that a society that does not maintain that balance will not remain stable.
Hence, justice is not a means to an end, like establishing order, getting revenge, or crime prevention. Justice is the ends in and of itself; thus, the benefit that is realized by a just sentence, even the Death Penalty, is justice itself.