First, I read the entire first page, and no one said "He needs help, we need to rehabilitate him". It did look like there were 10+ pages of comments, but I don't have the time to read all that.
But you are baked if you don't think something in society did this. I don't think it was "TV, Movies, Toy guns, Ernie & Bert", but it has been proven that child abuse, bullying, and lack of parenting(not parents) can do great harm to someones mind. The word "blame" is an easy word to use, and would be appropriate if it were only one thing that caused this incident. I don't think rehabilitation is the answer, or even possible. But the more information that is brought out about why incidents like this happen, the more society might be convinced to change and stop the causes that led to this tragedy.