A second objection to capital punishment questions the validity of applying the Old Testament law code to today's society. There are a number of ways to answer this objection. First, we must question the premise. There is and should be a relationship between Old Testament laws and modern laws. We may no longer be subject to Old Testament ceremonial law, but that does not invalidate God's moral principles set down in the Old Testament.
Murder is still wrong.
Thus, since murder is wrong, the penalty for murder must still be implemented. Second, even if we accept the premise that the Old Testament law code was specifically and uniquely for the Old Testament theocracy, this still does not abolish the death penalty. Capital punishment is to be implemented because of the sanctity of human life. We are created in God's image. When a murder occurs, the murderer must be put to death.