Finished watching it tonight. Agree with the above. The internet nerds actually contributed nothing other then they identified him before the actual killings and may have predicted it. However, I don't really think they contributed to his actions in any way. The guy was a complete psycho who yes craved attention but he was going to do what he did regardless. He spent the whole time setting up his defense in advance.
My other thought is my god the mom is a piece of work. Talk about white trash. The only thing missing was the trailer. If she lived in Oklahoma she would definitely be an OU fan.