I look at the Death Penalty from a slightly different angle, even though I consider other facts such as cost of incarceration versus cost of execution.
First; what is the purpose of incarceration?
Some say it is punishment. Some say it is to provide some measure of rehabilitation. Some say it is to provide a deterrent. Some say it is to separate the dangerous people from the rest of society. I go with that third meaning, myself. I'm not interested in vengeance, and I do not believe meaningful rehabilitation in our society is possible given our history of failure at it.
Given that the purpose of incarceration (to me) is simply to separate the dangerous people from the masses, I do think that cost-benefit analysis is a reasonable way to look at things.
However, such data is not readily available. The GAO said in 1989 that "
Federal data on the cost of implementing existing death penalty provisions are nonexistent... At the state level, cost data are limited... Few of these states have data on death penalty costs and even when available, the data were incomplete."
Now, let's consider another notable aspect of our legal system, which also plays into the Death Penalty versus Life Imprisonment argument; due process. This is directly tied to the Fifth and Sixth Amendments:
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district where in the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the Assistance of Counsel for his defence.
When we speak of terminating the rights of a person sentenced to death in favor of a speedy execution, we speak of terminating our own rights. If a person is not entitled to the best and most complete legal review to ensure that his rights (and our rights) have not been breached, when is it MORE appropriate? Imagining ourselves in a similar situation, and assuming for the moment that we were, in fact, innocent; would we simply shrug our shoulders, accept our fate, and say
"The State's Will be done?" Or would we fight with whatever resources we could bring to bear to free ourselves from our predicament?
As much as I understand that the costs of lengthy delays and extended reviews of death penalty cases and seemingly endless appeals, I would still prefer that to the curtailing of rights that are very explicitly stated in the Bill of Rights.
As to life-without-parole as an alternative to Capital Punishment, I would also consider that a live person can escape and threaten society again, no matter how remote that chance might be. A dead person can no longer harm anyone.
Given all of this, I think it's a tossup. I'm not against Capital Punishment, and if it takes years and costs bundles, well so be it; these are MY rights we're talking about, not just the rights of some criminal scum. If a state chooses not to have the Death Penalty (Michigan does not), then I guess that's fine too. Just make sure they stay locked the hell up.