I am concerned about posting here because this thread should be in a different forum. But, people seem to be debating this seriously, so I'll add my two cents.
The death penalty has so many flaws both in practice and in theory that I continue to be surprised by the number of people who support it.
People on death row, or worse, already killed by the death penalty, have been shown to be innocent. Isn't that reason enough to abolish this form of punishment and revenge? Note that I did not say "this form of Justice." The death penalty isn't about justice, it is about revenge. Someone commits murder, so we want to kill him? How does that make sense? If a person stabs someone, do we stab him as punishment? If someone starts a fire, do we light him on fire as punishment?
Besides, if someone kills my friend or family member, and I wish to murder the perpetrator, I am not legally allowed to do so. If I did, I would be prosecuted for the crime.
Yet the state is entitled to kill the perpetrator? Why does the state have more of as right to exact vengeance than I do? I am the one who had a friend or family member taken away from me. If I cannot take revenge on the killer, nor should the state.
When did killing people become an acceptable way for a civilized society to deal with its criminals?
The arguments in favor of the death penalty are rather weak. Some say it is an effective deterrent. This has been shown to be false. People who commit murder aren't thinking about the consequences. They either don't expect to be caught, or they are reacting emotionally and therefore not thinking rationally.
Do you really believe people in the middle of committing a murder stop and say to themselves, "I am going to go through with this crime because if I get caught it's just life in prison, no big deal. But I'd discontinue with this murder if I knew I would get the death penalty?"
Some say, "Why should be pay to keep them alive?" This is NOT a valid reason for killing people.
Some say, "We need to protect society from these people. What if they get a life sentence but escape?" This is not a valid reason for the death penalty. It IS a valid reason for improving prison security and making sure prisoners do not escape. Did anyone ever escape from Alcatraz??
And of course, let's not forget hat the death penalty is not applied fairly, and there is no way to ensure that it ever will be.