Not with capital punishment. In fact, it could be argued that the figures would suggest it has the effect of encouraging murder. I've posted them up here many times. A United Nations survey of research findings, conducted in 1988 and updated in 1996, found no evidence of the death penalty being a more effective deterrent.
Example:
- The murder rate in the US is 6 times that of Britain and 5 times that of Australia.
- Texas has the death penalty, but twice the murder rate of Wisconsin, a state that doesn't.
But OU's point was that deterrence or otherwise isn't the issue, the issue is "whether we, as a decent society, can live with such a primitive concept". It's a fair question.