Apparently Lanza destroyed his computer the same morning.
NBC reporter Pete Williams reported on Chuck Todd’s The Daily Rundown that (police) ‘had been hopeful that they could extract some information from the computer at (Lanza’s) home. He was very into computers. Before he left his mother’s house on the morning that he shot his mother while she was sleeping, he damaged extensively his computer. He took the hard drive out, pulled the disk out, and did a lot of damage to it,’ said Williams. ‘It’s not clear that (police) are going to be able to extract any information or not.’ It has previously been reported that Lanza left no online footprint. Police had been eager to examine Lanza’s computer in hopes of determining a motive in his killings or finding records of purchases of firearms and ammunition. [Ed: Bullshit. It’s well-known he stole his mom’s guns. So this is not a high-level bullshitter we’re dealing with, but most people won’t think twice because MPAI.] ‘If he visited certain websites, they are going to glean whatever information they can from that and see what it means,’ said the source, who spoke on the condition of anonymity because he is not authorized to discuss the investigation publicly. ‘Does he have friends he communicates with online? Was there a fight with somebody?'”
Not one of the /. commenters mentioned the most likely reason he did this. Apparently that site has been infiltrated by normal people (or “orcs”, as I prefer to call them).
Don’t make me walk you through this one, people.