The way I see it, bad decision-making based on a warped perception of the world due to autism is what pushed him into a downward spiral, and there wasn't the positive outside influence that he had needed to mature. He might not be a good person, but he didn't create himself.
True, he didn't "create himself." However, I would contend that no one really does. We are shaped by our upbringing and our limitations, to be sure. Yet, there comes the point where we need to make decisions for ourselves as to how we behave and treat other people.
In the case of Chris, the cards that were dealt to him are pretty harsh: incompetent/coddling parents and autism. But Chris is not stupid. He's not incapable of doing normal, everyday things. He can drive, design websites, speak (albeit limited) Spanish. He has a degree. And while he has had a considerable degree of social isolation, there were people in his life - his middle school teacher, Megan, Rocky, etc. - who cared for him and tried to point him in the right direction. Even some of the worse trolls pointed out the things he needed to improve, the "Father Call" being a case in point.
Yet, Chris does not listen. He does not take advice, unless its in line with some other preconceived notions that he has. The man has been continuously trolled, and often by the same means. Sure, he's gotten a little smarter, but now he needs Josh and his guys to monitor his emails and social media so that he doesn't end up hurting himself. The man does not learn. His lifestyle has been virtually the same since his childhood, when other autists have been able to put in the time and effort to move beyond their social limitations to lead relatively normal lives. Even then, I've seen cases of autism far more debilitating than Chris', and he has no excuse.
I guess what I'm trying to say is this: is Chris a victim? Yes. Is he an innocent victim who is just a product of his environment? No.