Capital Punishment

I feel like the death penalty is not used enough. I watched a show that documented life in prison for certain inmates and one specifically said he murdered someone to get the death penalty b/c he was too much of a coward to commit suicide, but he wanted to die. In such an instance he should be rushed to the “front of the line” and not be allowed to appeal.
Murder (not done in self defense) should be punishable by death. And second-offense rape should be punishable by death. I don’t think it should be given on a case by case basis either, it should be the punishment for anyone who commits those crimes, without consideration for any other punishment.
Obviously in some cases it may be hard to determine if the accused is guilty of the crime, and if death was the only option for the guilty I am sure many more would plead not guilty. But in instances where the accused admit their guilt or there is unquestionable proof, they should be put to death with no option to appeal. Not going through numerous appeals and not sitting in prison for years waiting to be put to death would cut down the cost of the death penalty. It's all a matter of choice and when you choose to end another person's life you should lose all rights you have. It's cause and effect, and taking responsibility for your actions.
And as far as wrongful convictions are concerned well that is where the “unquestionable proof” would come in..I guess “unquestionable proof” would need to be more clearly defined in order to be fair.
I would hate to be the person in charge of such a decision or on the receiving end of a wrong decision but I guess we would just have to take comfort in the fact that God is in control of it all.