This is quite a quote from Nancy's father Garry in the article: "We're pleased to have closure for the girls and for our family," Rentz said, referring to the Coopers' two young daughters, who have been in the Rentzes' custody since 2008."
The value of closure for the children is more important to them than seeing Brad serve (what I think) would be a more appropriate period of time in prison (because I believe its first degree or nothing based on the state's case). It shows the Rentzes have a very civil life-view, one including a sense of forgiveness and not focused on punishment. They have behaved in a very exemplary way throughout this process in how they handled everything... the initial moves for custody, being firm in their convictions but never lashing out, pulling together as a family, and making it more about the children than their own loss.