I think we have to draw distinctions between things we can learn to understand and things we will never understand. I think we CAN understand our feelings and how they have affected us, and how by examining these old feelings we can revise them and take away their power to harm us.
But I don't think we can ever understand why abusers do what they do. I know therapists like Ken Singer work on that and it helps to prevent the creation of new victims. So it's important work. But as a survivor myself I wonder if I will ever have the objectivity to genuinely "understand" what was done to me, in the sense of "why". At the moment I still think that real logical reasons just don't exist: where is the reason or logic, for example, in sexually abusing a child?
Just some thoughts. You're touching on an area I think about a lot.
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)