then there is the issue of control...which i guess is power.....and when it is damaged and stripped from an individual, especially in formative adolescent years, I believe there is an enormous undertaking in adulthood to search for it, find it (as deformed and malconceived as it may be), and usurp it.
It is what drives a pedophile....No control as a child to stop molesters, so that morphs into the insatiable desire to exert control over helpless individuals
My friend told me of her boss being emotionally abused and periodically molested as a child and she, the boss, used to harm animals....drowning a rabbit, did something to a dog I believe.
Anger over the loss of control, power over your own body and mind, manifests into a twisted desire to bring suffering to the weak.

I love the ending of the movie Session 9 where the psychologist is speaking to one of the personalities that is cohabitating inside of Mary??? I believe.
The personality has finally come forth to admit that it is the one that has coerced Mary into slaughtering her entire family.....It is also controlling all of the other personalities inside of the host. There is something about the different entities being asked where they reside, not certain here, but when the final dominant one is asked where it lives, it replies,"I live in the weak and the wounded."
An empty gaping wound left open, a void in the psyche, succeptible to infection and malignancy