He's a POS. I watched some of the teasers, and it was all about making excuses for a thug.
"Well somebody wrote a book and his mom and dad got divorced, and his dad may have beat on him, and there was alleged sexual abuse, and there as a rumor that aron wanted to be a cheerleader."
All bs. It doesn't matter what happens to you when you're growing up, it's your responsibility to not continue the behaviour.
But i doubt any of that stuff is true. He just thought he was cool having guns, and playing God by deciding who would live and who would die.