Great post. When people ask "why", this where the answers are found. This and some brain scans.
To be fair, besides looking at SF's role in raising her son, we need
to look at what role his father played or did not play in his life.
If true, that his parents were divorced when PF was around 12 yrs. old, this is a critical period in a young boy's life. He's graduating
from being mostly a momma's boy to learning how to become
a young adolescent and normally this would be learned from the father. Dad's role is to teach son how to become a man. And according to Dr. Drew dad's help the son to learn to regulate
aggression. (sound familiar here ?)
Often when Dad and Mom divorces at this age the son perceives
this as abandonment from his father. Anger sets in and takes
the place of depression, in many cases.
We don't know how much time PF's dad spent with him as a
young child. Being the youngest child, maybe dad was tired
of being a parent with the older siblings and he may have, in fact,
neglected and later abandoned the young PF. Maybe he was
hot to live the single life without the constraints of a wife and
child. My guess is PF resented this and took on an angry personna as part of his normal personality. Maybe he took
to drinking and or drugs to drown his sorrows and problems.
Many homicidal males have been shown to have been neglected,
deprived and/or suffered abuse or trauma in their earlier years.
I suspect this is true of PF also. MaF probably knows this also,
which may be why she's so protective of him even today. She
knows he did not get the same family/parental benefits her
other children received. This is why he seems to be the misfit
in the family. moo.