America's mental health institutions are fine. His parents' paranoia over what might happen were they to seek help for their mentally-challenged son were in no way justified.
And yes, he absolutely is a product of his very poor upbringing. He's not inherently bad because no one is; they're just inherently selfish, and Chris is a person who has absolutely no incentive to not be as selfish as possible, because for the past thirty-odd years, he's been allowed to sit at home and collect money simply because of his autism, and he was never taught how to properly function. This has resulted in him becoming a bad person, even though he is not inherently bad.
The issue is that his parents never bothered to push him to try at life, so now that he is well into his adult years, he has no incentive to start trying now. He developed a victim complex toward his autism, which he uses as a scapegoat for all his problems, and his parents never corrected him.
The people trolling him obviously didn't help things, and some of them were patently terrible as well, but Chris was a bad person before they ever got involved.