We are not talking about guesses, but hard clinical facts. These changes are not just a loss of capability (ie inability to walk, or remember things) but a profound change in the personality of the person involved. Ask someone who works in a Nursing Home.
You are correct. My wife was a physio treating the head injured. The incidence of rage is a part of frequent symptoms of head injury.
When I was in high school a friend's father had been head injuried in a minor car accident. About a year later there was some sort of accident in which his father died. It was sometime later that we talked about it. His father had changed utterly and was hurting the family in his violent rages. When his father attacked his sister he defended her with a knive and it was my friend who had killed his father.
There were no charges and no publicity. The nice man his father had been died in the car accident but it took a long time to realize that.
We are the "persons" we are. Brain damage can kill that person.
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