Hmm... Well, as I said, I am against capital punishment. Heres why: justice is justice and revenge is revenge. Capital punishment is about revenge, not justice. Sorry, but I dont see how or why should we support the "eye for an eye" logic, and think of ourselves as a modern and at least a remotely tolerant society.
The thing about killing a convict is first of all that it only serves to appease the public. He killed = he was killed. But thats all. Besides that, death penalty doesnt serve anything at all. If you keep him/her in prison for life, and get him to work, then we have something. Maybe put a part of his earnings to the family of the victim? All that fails if you simply strap him on an electric chair, to the amusement of sadistic cop thugs.
That, and I already feel uncomfortable enough knowing that the only armed force in the country is under state control. To have state decide who lives and who dies, hell to have anybody decide that, would be too much.
And there is the issue of certainty. I guess in certain cases it is clear beyond a shadow of a doubt who was the murderer. But in many cases it isnt. A couple of years ago we had a case, where a man was released from prison. He was charged with murder, and already served of some 20 years (I think), when new evidence came to light, and shown that he was innocent. Sure, he lost 20 years in prison, and that is terrible. But, if he was sentenced to death, what then?