In the case of the “man murders wife”, we can also ride the guilt theme, and allow the reader or watcher to feel sorry for the guy.
This is an interesting concept, and would be for the reader. While man commits the act, he’s experiencing a major breakdown or crack-up, and crying after the brutal act. The psychopath surely doesn’t cry after the act of murder, or does he? And how about the wife, cheating with numerous men… and the reader gets a good identity of the loving husband, and how he longs to take his daughter away from the cheating wife and negative atmosphere.
We can reverse roles and see how they play out on paper.
Ideas such as: guilt, fear and love – drawing from the true universal concepts and understanding what they mean.