Not to be negative and this is a great article, but SP was pretty much this person in the article:
From what we've seen, this guy was not "normal" but, not being what society sees, as normal, isn't a crime. We've not seen any record of criminal activity out of him, just odd behavior, until he went on a rampage. A disconnected family couldn't see those signs. He didn't have co-workers, and his gf/wife/roomie was apparently accepting of his odd behavior. Hopefully we'll know more when she gets back to the states on Wed. I kinda find it odd that she's not flown back already. Her children and other family members have be in a state of shock, as I'd be too, if this were my s/o or roommate.