In the UK system, the jury decides on guilt, and the judge decides the sentence. I believe when the death penalty was around the jury could also recommend mercy, but it was ultimately up to the judge whether or not the accused was hanged.
My thoughts on the death penalty are mixed, on a moral standpoint, I would probably say no to it, but on an economic and practical standpoint, yes.
Hanging a criminal and burying them is cheaper overall, in my opinion than keeping them incarcerated for life, and it does make damn sure they won't do it again. Of course on the other hand if you hang the wrong man then the mistake is irreversible, but although I don't know what the accuracy rate of convictions for murder is in the UK these days, I reckon it is most likely higher than it was in the 60s when the death penalty was abolished.
Then again you still have the moral issue that if you kill the wrong man, you have most likely killed an innocent man, and that in itself is wrong. The point therefore is to argue whether or not this evil is an evil worth having, in order to dispense justice to the majority of genuine murderers.
The next point is does the death penalty work as a deterrent? Now Pierrepoint famously said that it didn't, and since most murders are heat of the moment, often domestic disputes where logic and reasoning flies out of the window the moment someone picks up the kitchen knife, I would believe him. But what about premeditated murder, where somebody has plotted and planned to kill someone, not in a moment of rage, but in a clear, cool headed thought process over days? One could argue these people are mentally incapable to stand trial, and whatever ails them that they carry on and kill the person with no thought for the consequences would mean that it wouldn't deter them anyway. But I think that if it can be proven they planned to kill someone, and furthermore attempted to dispose of the body or attempted to cover up their crime, the death penalty would be appropriate, because I feel that there is no rehabilitating these people.
The British justice system at the moment suffers from not being seen to actually dispense justice where its due. Cutting time off jail sentences for 'good behaviour' is in my opinion farcical, and not based at all on 'the poor lickle murderer' but the fact that prisons are overcrowded and they want to punt people out as soon as possible before the next lot arrive.
So why are the prisons overcrowded? You could argue prison sentences are handed out for minor offences that don't warrant them, non payment of fines, or moral degradation in society. I don't believe in the latter to the full extent of its meaning, but I do believe that a lot of people see the justice system as incompetent, and believe they can literally get away with murder, therefore more are committing crimes, leading to more convictions and more prisoners. I believe that the death penalty would help to bring some of these people back to reality.
On its own, the death penalty wouldn't reduce crime figures much, but combining it with a more streamlined system to process criminals would. This doesn't mean I am in favour of mass trials though, I still believe in a fair trial, and to be honest, I wouldn't know exactly where to start on the justice system as it stands. Your thoughts Jubal?