Have faith.
Many - not all - of the individuals who take such a point of view are not ruled by a spiritual connection, but by pride. I believe many of them like to take on this position as a means of feigning moral superiority. Certainly, this is not Christian.
My church favors respect for all life, even that of murderers. I would agree with this teaching if it could be ensured that such criminals would never harm others again. As there can be no such accommodation I feel comfortable with capital punishment - as long is the convicted are beyond the shadow of a doubt.
Conversely, when such criminals are put to death, I don’t believe that it should be done out of a sense of vengeance. To do so would to become like the murderers. It should be a cool, simple and intellectual matter of law.
The thing that really gnaws at me about such debate is that it seems that some Christians appear to give a higher degree of attention to the value of the life of the criminal, rather than to that of the innocent and the victim.
I see this attitude more of being “liberal” than it is being “Christian”. I certainly don’t like to put myself in a position to quantify the faith of another. Yet, I don’t understand it and while I used to strain to grasp such a mindset, I no longer wish to come to an understanding. I see such a worldview simply as foolishness, which through the grace of God, I will never be able understand.
Numbers 35:33
Do not pollute the land where you are. Bloodshed pollutes the land, and atonement cannot be made for the land on which blood has been shed, except by the blood of the one who shed it.
The death penalty is a command.