There is of course no point, but the issue with the death penalty is that there have been times when innocent men and women have seemed very guilty, but were in fact innocent and lost their lives.
The cases that really did for the death penalty here were that of Timothy Evans, hung for killing his wife Beryl and daughter Geraldine in the 1940s, he even confessed to the crime. His landlord, mild mannered clerk and retired met. police officer John Christie should have been looked at more carefully and Evans had such a low IQ his confession should have been questioned - of course Christie had killed the wife and baby alongside at least 6 more women including his own wife at his run down Notting Hill home.
Then there was Derek Bentley, who during a stand off with the police after a robbery shouted to his fellow robber "let him have it", but did he mean shoot the cop or give him the gun, either way Bentley himself killed no one, but hung none the less.
Finally Ruth Ellis, who defiantly did kill her lover, shooting him dead outside a London pub, but she was a long standing victim of an abusive relationship - however because she went to the pub with intent to kill rather than it being in the heat of the moment, she hung. Hers is a difficult case, because she did plan a murder, and did it with intent, but was her mental state sufficient mitigation to commutation to life rather than death??