It may seem to be a cheap option to apply the death penalty over life in prison but it is not. The appeals process needed to make sure that you get it right is very expensive, costing multi millions of dollars and taking up a large amount of court time. As I stated in a post on another topic, it was calculated that the appeal process for the last Australian executed cost so much that they could have kept him in prison for 1000 years with change left over. In NZ the Bain case (not a death penalty case) the cost to the crown of an just one appeal to the privy council and retrial cost $3,500,000. A death penalty case would be multiple times this.
I don't know
@Rob c I read about one of the last UK capital cases where the execution happened within months of the sentence being delivered and that included an appeal. Can't remember the case. Back when we did have capital punishment, we didn't have a long convoluted appeals process. Maybe one or two appeals at the most. We could always go back to precolonial ways when us Maori had a different system which was relatively quick and efficient. Probably put the legal profession out of business though.
The
Bain case and the
Teina Pora especially the Pora case, do create significant doubt about capital punishment, but also the cost that miscarriages of justice can cause. In Bain's case, he was eventually found not guilty of the murders of his family in a retrial 15 years after the murders, that was granted only after the Privy Council in London found that there was a significant miscarriage of justice. In Pora's case when he was 17, he voluntarily confessed to a murder (1992) that he did not commit and was sentenced to life imprisonment. He appealed his conviction in 2000 after the semen found in the victim belong to a serial rapist, Malcolm Rewa (aged 66), who was convicted of her rape in 1999 but not her murder despite two trials because Pora was still in prison due to his conviction. The Court of Appeal ordered a retrial and Pora was again found guilty because of his confession despite no forensic evidence linking him to the scene. In 2014 the Privy Council in London quashed Pora's conviction. However Rewa's third trial held recently
found him guilty and since he already has serving a sentence of preventative detention with a minimum of 22 years without parole, the judge has stated that it is up to the parole board whether or not Rewa will ever be released from jail.
Both cases illustrate the costs both in human and financial terms. If capital punishment still existed in NZ, both Bain and Pora would've met the hangman and whilst their subsequent appeals may not have progressed in they way they did, a greater miscarriage of justice would've occurred because both men would've been long dead. Secondly, the legal costs alone incurred by the NZG in these two cases will have been well into the millions, plus the restitution payout to Pora which was $2.5 million. That's just two cases, Arthur Allen Thomas was wrongfully convicted of the Crewe murders back in 1973 after being stitched up by the police, which cost him his farm and marriage, and after his appeals were eventually successful, the NZG had to fork out $900,000 which was a significant amount back then (1980s).
I prefer the system that we have at the moment. It is not perfect, but it is not an absolute like capital punishment is, so does allow for mistakes to be more easily rectified to the aggrieved party. Yes there are costs to both systems, but some costs are more bearable than others.