For anyone who needs context, because on its face this is a confusing document, the actual letter was intended to be delivered to her mother. It conscripts said mother into a detailed scheme of witness tampering heavily involving her brother. Kouri concocts a fake history of drug use for her dead husband with numerous details designed to create reasonable doubt and open up the idea that her husband was a habitual fentanyl user, while explaining away the fact that no drugs were found in their home. She also implores her mother to send photos of her nieces to the press as an implicit threat against one of Eric's sisters (Eric's family were pretty firmly in the "She killed him" camp at this point). The large "Walk the dog!" heading, along with other notes throughout, is understood to be an instruction to get out of the house before reading the letter and then to dispose of it somewhere safely.

They don't think anything is their fault.

In her mind her husband was probably awful and abusive for not bailing out her 1.5million in debt.

I've dated women like this. Had a few break ups where I was told how awful horrible man I was for not paying off her debts for her. The irony was I had no money... but she thought I did... god I had one lady I was dating a month who started asking me to pay off her car loan and when I said no she threatened to beat me up.

And the scary part is lots of people who are like this are out there, and people like them because they are so superficially charming and sociable. It's only once you have a legitimate relationship with them that the crazy starts to show, and for some people, they can't walk away and can't see the red flags due to the charm.

Causality is hard at work; as certain as death and taxes.