Executing a convicted murderer isn't "an evil". It's justice. And the purpose is not to "repay" the criminal for his actions, but to protect society. The criminal has the choice to obey the law, and can choose not to commit murder, which is the only "evil" in this equation. Once the criminal has made the choice to take an innocent victim's life, the people of the state have the right to protect themselves from him and others like him by executing him in accordance with the laws of the state. If you are indeed interested in "Grace", consider that even the grace that God extends to us is the result of the death of His Son for our sins. Our sins were not forgiven until the punishment for them had been placed upon Christ.
These two need to be executed pronto. I don't agree with the suggestion that putting them in prison for life is the best punishment, forcing them to "think about it every day for the rest of their lives". That's what any normal person might do, but these two aren't normal, they don't feel remorse or regret like a normal person does. Their consciences have been so battered that they don't work any more. If you imprison them and they ever manage to escape, someone else will likely be killed as they attempt to keep from being re-captured. Society deserves to be rid of anyone who would rob and kill a minister who had done nothing wrong, who had scores of devoted friends, and had worked to be a positive influence in the community. The story is obviously a load of crap, a pathetic attempt to explain away pure evil. Think about it, if you were the victim, would you turn to either of those two for a sexual partner, even if you were gay? Don't believe it.