[QUOTE=Askance]
You are confusing the deterrence effect on others, with the reduction in murders if the killer him/herself is let out to possibly kill again.
The death penalty has no deterrent effect on other killers, because most murders are committed on impulse, or by people who are convinced they will never be caught no matter what (ie they are stupid).
[/QUOTE]
I’m not confusing them at all. These studies are claiming that between 3-18 murders are prevented by deterrence on others not that the executed criminal would have otherwise himself killed between 3 and 18 people. Your statement that the “death penalty has no deterrent effect” seems to be very much in question.
From the linked article (bolding mine):
"“The evidence on whether it has a significant **deterrent **effect seems sufficiently plausible that the moral issue becomes a difficult one,” said Cass R. Sunstein, a law professor at the University of Chicago who has frequently taken liberal positions. “I did shift from being against the death penalty to thinking that if it has a significant deterrent effect it’s probably justified.”
Professor Sunstein and Adrian Vermeule, a law professor at Harvard, wrote in their own Stanford Law Review article that “the recent evidence of a deterrent effect from capital punishment seems impressive, especially in light of its ‘apparent power and unanimity,’ ” quoting a conclusion of a separate overview of the evidence in 2005 by Robert Weisberg, a law professor at Stanford, in the Annual Review of Law and Social Science.
“Capital punishment may well save lives,” the two professors continued. “Those who object to capital punishment, and who do so in the name of protecting life, must come to terms with the possibility that the failure to inflict capital punishment will fail to protect life.”"
Dumbguy, you might be right or correlation vs. causation. I’m making no claim that the data is conclusive. But, the data is interesting enough that I believe that out and out claiming that there is no deterrent effect is not quite right. And if there is a deterrent effect, I have to rethink my position on the issue.