OH MY GOSH! None of this is your fault at all! I don't care HOW bad you were as a child, the way they handled it was out of line and emotionally damaging! I seriously doubt your Therapist would change her view on the situation AT ALL. Please don't put any of the blame on yourself.
Not to mention...every troubled child who has issues with acting out, acts in such a way for a reason. Whether it is lack of attention, validation, a response to emotional abuse, gaslighting, etc.
I'm sorry these thoughts are racing back. This just happened to me Friday and it feels awful.