No one has fully answered the question as to whether state sanctioned killing is used as a dterent or a punishment, or both?
It keeps the state paid murderer in a job:-
whether its "Chopper Square" in Saudi Arabia
or "death row" in USA
For me, state execution is not a moral, but a political question.
The majority of comments on here allude to murder as a reason for the state to execute someone.
State execution can and has been used for many other "crimes".
Is a "crime of passion" a reason to be killed by the state? [The French have such crimes included in their law].
Should Armed Forces Personnel ordered to open fire on unarmed civilians be tried for murder - or their officers? If found culpable, should the state kill them?
If a person has a "confession" forced out of them by torture by our intelligence services - which is alleged to include "acts of terrorism" - should they be executed?
Or do we adopt a judicial system which acknowledges "due process" - and the right to appeal?
Does the State have the right to withold information to protect its agents and obstruct justice - if a person is executed for alledged crimes and later proven not guilty and pardoned after their death?
Do we have a robust enogh justice system which is impartial and fair?
Can we guarantee there will never be political, personal or state interference in a case, or intimidation of witnesses, or witholding of information by the police or providing false information to secure a conviction....
I dont believe we have such a robust system in place.
Even if the sun shone out of Ian Duncan Burnett`s arze [hes the Lord Chief Justice] the system is open to deliberate interference, deliberate manipulation and abuse.
To allow State Execution is to abolish "due process" and suspend any system of justice; to replace it with fear of ultimately taking someones life.
Thats not justice.