The death penalty is an appropriate consequence for particularly serious offenses, and it expresses society’s aversion to the act for which the punishment was imposed.
The death penalty deters people from committing serious crimes.
The death penalty allows loved ones of murder victims to feel a "closure" that enables them to overcome the psychological distress caused by the murder of a loved one, and to continue their lives.
Capital punishment is necessary to protect people from criminals who may do harm to those around them, whether inside or outside prison.