Once you execute someone, you can never ever bring them back again. IF you find out you killed the wrong guy, there is absolutely nothing you can do to make it right. No amount of compensation, no amount of apologies can ever make up for killing an innocent guy.
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Innocents are more at risk without the death penalty.
We all know that living murderers, in prison, after escape or after our failures to incarcerate them, are much more likely to harm and murder, again, than are executed murderers.
No knowledgeable party questions that the death penalty has the most extensive due process protections in US criminal law. Therefore, it is logically conclusive, that actual innocents are more likely to be sentenced to life imprisonment and more likely to die in prison serving under that sentence, that it is that an actual innocent will be executed.
Thirdly, 10 recent studies find for death penalty deterrence. Some believe that all studies with contrary findings negate those 10 studies. They don’t. Studies which don’t find for deterrence don’t say no one is deterred, but that they cannot measure those deterred, if they are.
Ask yourself: “What prospect of a negative outcome doesn’t deter some?” There isn’t one, although committed anti death penalty folk may say the death penalty is the only one. However, the premier anti death penalty scholar accepts it as a given that the death penalty is a deterrent, but does not believe it to be a greater deterrent than a life sentence. I find the evidence compelling that death is feared more than life - even in prison.
In choosing to end the death penalty, or in choosing not implement it, some have chosen to put more innocents at risk.
Furthermore, possibly we have sentenced 20-25 actually innocent people to death since 1973, or 0.3% of those so sentenced. Those have been released upon post conviction review.