If you look at BarSinister's post you should see without much reading that the states with the dealth penalty have a higher rate of murder but it is marginally higher. It seems that in reality, with it or without it, murder rates stay much the same country wide.I am sure death penalty is not the only factor for high murder rates, talloola. There probably are other factors. But I think death penalty is a contributing factor.
It seems to me that people who commit murder either don't care if they get caught or actually believe they never will be caught. Adding or taking away the death penalty would not make a difference. Most people don't actually fear death. It's the manner in which they die they fear. Since the death penalty now is a simple shot like we all choose for our ailing pets, and since many murderers are ailing in someway or another, they may welcome the peaceful easy needle they would receive. Not death by cop (suicide) but death by law (suicide).