I found an article about different kinds of family annihilators, and CD fits one of them.
Examining familicide cases while exploring the psychological profiles and possible triggers of individuals who carry out these horrific acts.
www.crimetraveller.org
There are two types describing such killers:
Per Neil Websdale, a Professor at Northern Arizona University, CD would fit into
"the “livid coercive” killer who is motivated by anger and rage. They show control issues and may have abusive tendencies achieving their self-worth by exerting authority within the home. Should this marriage begin to fail maybe because of such controlling issues and the wife and children try to leave, a lack of control and feelings of humiliation could prompt such acts of violence against his family."
Per another group:
"In the influential Yardley, Wilson and Lynes research, they looked at cases over a span of 30 years and grouped their case studies into four categories looking at the motives behind the killings. ...
Self-Righteous Killers
These are individuals, usually fathers, who place blame on others for their actions. They often blame the mother of their children for being the cause of the family breakup or for preventing him from having access to his children. They see themselves as the provider of the family and if they are unable to meet that role they can enter dangerous territory.
“These are executions. They are never spontaneous. They are well planned and selective. They are not carried out in the heat of the moment or in a fit of rage. They are very methodical and it is often planned out for a long time.” – Professor Jack Leven
Often they are looking to cause pain and suffering to their partner or ex-partner and can use their children to do this. Fathers who fall into this category can kill their children and leave the mother alive to ensure maximum pain and suffering. As they blame the mother, they can often make contact just before they commit the murders to tell her what they are about to do, knowing there is nothing she can do to prevent it."