The reality is we can't assume that we know how someone was brought up or that there is nothing wrong with them. We can say there was no abuse and outwardly it appears that they are perfectly fine, but the reality is their own perception is their own reality.
I grew up in a family that had it all. Gave me anything that I wanted and from the outside looked picture perfect. The reality was that I yearned (still yearn) for love and affection that I never got, but in my opinion WAS given to my siblings. My relationship with my parents is fractured. I have no doubt that they would say that they have never treated any of us kids differently, and would think it preposterous that I'm upset about it. Yet I constantly feel like I'll never be good enough to win their approval, and I am a successful business person. What I'm saying is that no matter how silly my parents would think it is, my perception of how I feel I've been treated is my reality. You never know what instances in someone's life make them feel the way they do.
Perhaps AJG was a stand up citizen and good student. Maybe he felt like no matter how good or impressive he was, he was never good enough for his mother. And that he was not worthy enough to have a father who wanted to be a part of his life. It is very hard and sad to feel unloved when you see those people so capable of loving others. The difference between him and I is that I have found ways to cope so it doesn't swallow me alive, and obviously he didn't.
I'm certainly not saying he's not a sociopath but it's fickle to say that a person had everything they could ever want and there's no reason behind the madness.
The truth is, you never know.