Quote:This shift makes perfect sense if you accept that the only real justification for capital punishment is vengeance.
I think the above sentence reflects a bit of the author's bias--the claim that vengeance is the "only real justification" isn't particularly well supported. Although I personally have a problem with the death penalty, there is another justification for capital punishment, and that is justice. Vengeance arises from a sense of justice but often goes further, hence the negative "spin". Justice in itself, however, is a worthy goal. In some people's eyes, life in prison isn't all that severe of a punishment; forgetting vengeance, victim impact/emotions, etc.--when someone robs another of life, is it just to simply confine them in a cell where their room, board, and healthcare are paid by taxpayers? Is loss of freedom a just exchange for loss of life?
I believe that victim impact statements are perhaps neither good nor bad for the jury/justice system, assuming the jury is capable of distinguishing fact from emotion. However, the statements ARE needed for the victim/survivors. Regardless of which way the jury decides, an impact statement allows the victim to confront the perpetrator and publicly announce the severity of the crime. Since the rest of the court case is governed by what the judge allows, with particular attention to the rights of the accused, allowing the victims to have their say in court seems just to me.
(But, I'm a socially-inept scientist, not a lawyer

)
(The last paragraph quoted by Joe summarizes my reason for opposing the death penalty--the reason is not based on justice, but mercy. As stated, capital punishment often assumes that the criminal will
never change or repent of his/her ways. Given a choice, I would forbid capital punishment in order to allow the criminals this opportunity, however unlikely they are to change. But this is mercy, not justice.)