Some philosophers of ethics in contemporary Western thought argue that the death penalty is not a deterrent for perpetrators of murder to refrain from committing this crime, because the killer kills their victim while fully aware that they will face the death penalty. On the other hand, another group of thinkers and legal professionals believe that the death penalty holds enough deterrent power to prevent anyone from contemplating the crime of murder. Others argue that the death penalty should be replaced with a system of reform or rehabilitation, which they consider the optimal way to prevent murders. Punishment and imprisonment for a legally defined period work to improve the criminal's behavior and transform them into a law-abiding member of society in the future. Through these different perspectives, this research discusses the effectiveness of the death penalty in deterring crime and ensuring safety and security in society.