I'm for the death penalty and I'm Christian.
I have an obligation to protect my family. Killing murders and rapists keeps those who would consider it wondering whether it would be worth dieing for. I live in a country with the highest crime rate in the world. Ever since the death penalty got taken away crime has skyrocketed each year. It's easy to blow things out of perspective - I'm no philosopher and I'm not really in a position to argue the precise meaning of biblical metaphors but in certain extremes like war and african crime I think killing unfortunately plays a daily role. Christian or not - you are affected by crime.
NationMaster - Statistics > Murders (per capita) by country NationMaster - South African Crime statistics
VS Germany
NationMaster - German Crime statistics
Colombia has more murders but I think in total crime South Africa is still top in the world.
