Bailey Sarian didn't cover this case, so I had to read about it myself. It piqued my interest for many reasons, mainly because I wonder what goes through the mind of a man who kills his own wife and two young children. Money and having a mistress seem like vague answers. I didn't get a complete answer because Chris, the perpetrator, never fully confessed to the murders. Even though he's serving his time in prison, he is not ashamed and still thinks very highly of himself. (I know, WTF)
Anyway, from what I gathered, the psychology behind it suggests that religion often connects to violent criminal cases like this one. Evil and strong religious beliefs often go together, as do mental illness and religious obsession. (I didn’t agree at first but…) This can also be seen in deranged cult leaders, both in fiction and reality. Chris is also a preacher's son who grew up in a VERY religious home which is what made me wonder if there is a link between religiosity and dangerous states of mind leading to evil deeds.
I'm not saying religiosity is bad but extreme religiosity can become harmful to mental health especially when it rigidly suppresses basic human instincts like sexuality, anger, and rage. When these natural instincts are condemned and repressed, they don't disappear, instead, they form an unconscious complex or a "splinter personality" that includes these rejected parts of ourselves. Carl Jung referred to this rejected part as the shadow. Spiritually is great and all that but when religious or spiritual beliefs lead to the condemnation, denial, and repression of these primal passions and emotions, the repressed parts can become more powerful and destructive which result in dangerous states of mind and evil actions.
So, when our natural emotions and instincts are denied and pushed away, they can manifest in harmful ways, leading to tragic outcomes like those in this case.
I didn't explore the psychology behind it, so I can see he was innocent. He is evil and will stay that way. I just wanted to see the motivator, which is, oddly enough, not cruel. But, insanely enough, humans make it unless they have control over their desires and live happily, knowing they are serving God's purpose by being that way and knowing that it's no one's fault. But, of course, that's not always the case.