No. Stats prove that the death penalty does not curb violent crime(God must not have those stats yet). Although it may get you elected depending on where you live(can you say Bible belt). I say part of the cost of society is to house dangerous members but to kill them only sends a double standard. That is that the killing was okay but your reason for doing it was wrong. How bout this- There is no good reason to kill. Murder is murder. Is this confusing? If you murder you go to prison.
This is something I grapple with in regards to the Bible. It seems the idea of murder or death as a solution to anything is flawed. Resorting to kill another human for any reason seems to go against basic sense. The more I read the Bible the more I see it as a crutch to those who choose not look for better solutions to lifes dilemas(laziness? fear?). If its bad to God its bad to me so Ill just kill it(cause Gods gonna anyway).