Believers know that 'capital punishment' is wrong. It is wrong because a criminal act is not a cause, it is a symptom. A person does not become a murderer when he kills somebody, the act of killing another person is an expression of the nature of fallen man. Ye are of 'your' father the devil, and the lusts of your father ye will do. The idolatry of the natural man, is what motivates his behaviour, it gives him a purpose in life.
Natural man believes that a person's behaviour, determines what a person is.
In reality, what a person is, determines his behaviour. Natural man believes that a person can 'choose' between what is right, and what is wrong. Natural man will argue that because a person has a 'choice' between, what is right, and what is wrong, a person should be punished for making the 'wrong' choice. This is natural man's excuse for committing atrocities. Natural man does not, and cannot believe, that forgiveness is the answer to all his problems.