Welcome to FR. There are certain patterns that run in the families of tyrants. The DSM-VI is not leftist psycho-babble. Time will tell if this diary is authentic or not. But it does not remove Hitler's own responsibility, as I'm sure you know.
oops DSM-IV
Alice Miller a professional in the field has written
many books on this subject including, "For Your Own Good"
which has a chapter on Hitler and his family.
It does not excuse what he did ( the man was pure evil)
but explains how a person can be pushed along to this.