The Fifth Amendment:
No person shall...be deprived of life, liberty, or property, without due process of law.
The Constitution already provides for the death penalty as being legitimate, so long as due process of law preceeds the punishment. In some cases, the trial may be less-than legit (Saddam's, for instance), and in such a case, no American court should ever pass a sentence on a criminal.
The Eighth Amendment:
Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted.
Now, seeing as the Amendments wouldn't necessarily conflict with each other, why would the Constitution provide for the taking of one's life with due process of law, but outlaw this as a cruel and unusual punishment?
Because it isn't one.
This is not an arguement about what is in the Constitution, but
what should be. It's not so long since an electric chair that melted the eyeballs of those in it was considered a fine punishment... in some places it still is, of course.
Saying that the Constitution - a centuries old document - says something is not cruel and unusual is sufficient justification is plain wrong; society, morality has been shown to change throughout history. The US Bill of Rights was, I believe, written at a period where the genocide of the Native American race was 'ok'. You can only evaluate state executions through a modern perspective, not citing the text an (effectively) ancient document which itself (in the case of the Eighth Amendment text) is taken from the
English Bill of Rights of 1669. And the UK has, of course, abolished capital punishment yet kept said text.
I agree with you that castrating sex offenders or chopping off a person's arms are less than humane, and would be "cruel and unusual." However, no US capital punishment still enforced inflicts a cruel and unusual punishment, as death often occurs within a few seconds or minutes of the paralytic injection taking effect. The contrast, of course, would be chopping one's arm off and allowing him to bleed to death, or shattering one's ribcage with a baseball bat.
Actually, that's wrong (RE: lethal injection) - the average time for a lethal injection to kill is 7-11 minutes. Also, if the anaesthetic fails (as seems to be likely, given the prior 88% figure), it's an extremely painful death. Finally, in at least one case it has taken around 35 minutes for the prisoner to die. Worth re-noting that the paralytic agent means those 7+ minutes could be spend in excrutiating, horrific burning pain and we wouldn't know, though.
Of course, we still consider a murder a heinous crime when the victim has a painless death, so I'd say the inherent cruelty is in the act of
killing - not the method, or the type of victim you choose.
Finally, surely you'll note my point - that what is cruel or (perhaps more relevantly) a 'just' punishment is very much a matter of personal viewpoint when it comes to inflicting corporal punishment? There are people - a great many - who'd view the death sentence as being just punishment for rape; what is the demarcation we place, between crimes that kill and crimes that 'merely' destroy lives?
Is it right for the state to offer these punishments, to give into the most basic and crude instincts of revenge?
This sentence is interesting, because isn't the entire justice system a form of revenge, to punish a criminal for what he's done to another?
No. Justice is different from revenge - it has to be. Revenge is, simply, uncontrolled rage; the basest human instincts of violence. Revenge offers neither a fair nor
just punishment.