The topic of 'motive' is central to the podcast episodes provided, as they delve into the complex and varied reasons that led the perpetrators to commit their crimes.

Several episodes explore the financial motives behind the murders, such as avoiding debt repayment, avoiding child support payments, and fear of implication in financial crimes.

Other episodes focus on personal motives, including the blurred lines between fiction and reality, hatred, frustration, and a desire for personal freedom, and the disturbing involvement of a respected professional.

The podcasts also highlight the importance of thoroughly investigating the motive, as it can be a critical factor in understanding the crime, identifying the perpetrator, and ultimately achieving justice and closure for the victims' families.