I posted stats elsewhere, but those saying the death penalty is not a deterrent would have to show the true cause of such a significantly lower per capita deaths by overdose in Singapore vs western countries.

My current feeling is that there is a limit we should be willing to spend, as a society, on someone who chooses to actively inflict harm on or enable harm to come to others. I struggle to see the humanity or benefit to society in sending someone to prison for the remainder of their natural life that satisfies either the condemned or the victim. Capital punishment has become significantly more expensive than life imprisonment, which may be one of the strongest arguments against it, imho.