People who have been abused may carry a lot of anger about what happened to them. Abuse can be a way to express that anger. Even if they have pushed the anger out of their conscious awareness, it can come out in subtle or not-so-subtle ways in intimate relationships or
parenting styles.
People who experienced abuse early in life may have formed an avoidance attachment style in childhood.10 This may cause them to avoid forming close relationships in adulthood, which can lead to behaviors such as pushing others away or responding to attempts at closeness with anger.
https://www.verywellmind.com/the-cycle-of-sexual-abuse-22460
Many serial killers experience childhood trauma or early separation from their mothers. As a consequence of that trauma or separation, scientists believe, they learned to suppress empathy or suffered damage to the areas of the brain that control emotional impulses.
One of the best-known studies of serial killers is the National Center for the Analysis of Violent Crime’s “Diathesis-Stress Model,” which suggests that childhood events play a role in the development of violent behavior.
This model suggests that a person may possess a “diathesis” or trait that puts them at risk of violent behavior, which is then combined with a “stressor” or a triggering event that alters their behavior.
Thus, the combination of both an at-risk personality and a trauma-inducing event may set the stage for a dangerous and violent outcome.
In some cases, violence or aggression may be experiences as the result of an individual’s experiences with child abuse or other traumatic events. A traumatic experience or event has the potential to alter an individual’s thought processes or emotionally distort reality, which could explain some of the behaviors associated with serial killers.
https://www.newzealandrabbitclub.ne...rauma-affect-serial-killers/?expand_article=1
Various excerpts in attempt to try decode Sachi behaviour