@DharmaGirl
A lot of us do this, but very few of us understand
why.(not that I do completely, of course)
The reasons why are complex, but the following may be part of the mechanism and underlying cause.
1. Child is abused.
2. Child is dependent and powerless. Child needs caregiving in order to survive.
3. Abuser is an existential threat to the child, and is the source of terrible pain/distress.
4. Child fears rejecting(resisting, defying, lashing out against, etc...) the Abuser, b/c doing so could increase the severity of the abuse or even be life-threatening. Also, the Child fears rejecting the Abuser b/c the caregiving(what little there is) could stop completely, resulting in death.
5. So, the child
rejects themselves(turns against themselves), labels themselves as 'the Monster'.
All of the anger, hate that is really for the Abuser(as it should be), is re-directed toward the Self. The Child begins the pattern of Self-anger, Self-hatred, Self-destruction, Self-blame, and much more.
Of course if actual skilled programming is involved, the issues become even more complex.
Anyway, some food for thought.