Personally I do not believe that anyone is "born evil". Nor do I believe you will become abusive if you have been abused as a child, or violent if you have had brain injury. Just like I do not believe that if you let your child run free, your child will be harmed by a stranger.
What I do believe is that an abused child has a greater risk of growing up to abuse others than a child without abuse in his/her background. And a child who has had brain injury has a greater risk of growing up to be violent than one who hasn't had any injury. And a child who runs free is at a higher risk than those who are helicoptered.
Saying "I had a concussion and I am not violent". Or "I was abused and I don't abuse my kids" really does not change the facts that certain things can, and do, raise the likelihood of violence and abuse. Finding out what is in GG's background does not excuse his evil behavior, nor does it really give a reason. But understanding what is in GG's background helps further the understanding of what to look for in others that may put them at a higher risk of becoming another GG. And someday the hope is that we will be able to identify children at risk for these behaviors, and intercede with some sort of help to prevent that life from going down the wrong path.
Just my thoughts....
I certainly agree, but there is no evidence that brain injury causes someone to have pedophilia desires, or puts them at a higher risk for them. This was not just violence. This was a sex act against a child. I don't think we can really look at this case to help in future cases, as far as brain injuries go. Because, what we have here is a crime associated with pedophilia. You have to desire a child, to seek them out to rape. Brain injury causing pedophilia is not something I will EVER believe.