That assumes the victim shares the same status as the perpetrator.
Murder is the unlawful/immoral execution of a person.
The death penalty is the lawful/moral execution of a person who has performed a heinous act.
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Death of sentient beings is an inherently immoral act, regardless of how it’s done and for what reason. In a court of law, the prisoner is already unable to cause more harm, at that point, killing is unnecessary, because the purpose of punishment is to make sure they don’t commit that act again, meaning that life in prison will do the job.
