I am not a psychiatrist, so take this with a bucket of salt. I'm calling clinical schizophrenia, delusions of persecution, delusions of grandeur, and he is very, very glib. The thing is written quite well, so well I questioned its authenticity except for the fact that nobody would have had time to fake it in that detail between Friday and now. That's how he got past the cops. It's so far out that all he had to do was appear halfway normal and they'd have been fooled.
What I got was an intense sense of entitlement, a conviction that luxury should have been provided for him first by his father, whose career hit some rocks (although nothing like this one), then by his mother for failure to marry into wealth, and lastly by his failure to win the lottery. At no point in this did I get a sense that he even had a concept of "earned". Two jobs in his life, one building a staircase for a friend, the other quit in one day because it was "beneath" him. I'm guessing that he couldn't do it, probably due to severe social challenges. It was janitorial, BTW.
The problem with the screed is that the author swerves between moments of lucidity and moments of batshit nuts. People around him - nearly everyone he cites - knew he had a serious problem. One of them broke off a longstanding friendship when he talked about how he was going to torture all his enemies, which turned out to be nearly everyone around him with a satisfactory sexual relationship denied to him either by the inherent wickedness of women or the fact that they recognized that he was batshit nuts. I'm opting for the latter.
What is chilling is that he clearly recognized the problem but managed to project blame externally. This thing would be too perfect to be believable if he hadn't actually gone out and done some of it. I would not recommend reading it unless the reader is very patient and pathologically curious. Me, I'm going to try to forget most of it.
Where did you manage to get a copy of the entire 141 pages?
The link I managed to find is missing the last 4 pages.
He did mention working on his "diary" as one of the ways he passed time when he first got to the college in Santa Barbara. It seemed to me a reason why the first part of the manifesto, his babyhood and childhood years, seemed so much more rational than the latter part of the manifesto.
I'm not a psychologist, either; but I think this screed will be studied and used as a case study in classrooms for decades to come. Everyone who might have helped this guy missed the boat; against an impossible backdrop of HIPPA laws that make it almost impossible to commit an narcissism-based, articulate denier for care.
The problem with Asperger's, OCD and anxiety-based disorders is that the person focuses obsessively on an idea to the exclusion of any obvious solution, even as time passes and more years bring more skills. As others have posted, nothing but his obsession with being a loser prevented him from purchasing some sex from a professional, or even an amateur. But he also had an overlay of wanting only the best, highest and most "exquisite" experience -- a word he used frequently. Only a fantasy perfect sexual experience with a willing hot blonde would do.
He is stuck in feeling powerlessly excluded from the decisions surrounding his parents' split and shuttling him back and forth. His father passively fails to defend him when the stepmother is harsh and rejecting. He has no power. His father is large, handsome, of the dominant racial group, and advertises his sexiness inappropriately. The shooter is small, mixed race, and tossed from pillar to post.
When he finally gets old enough to date, he even says that no one explains how it's supposed to work. He somewhat accurately sees all the downsides of the post-Sexual Revolution free market in sexual commodification, where competition based on looks, money and sex appeal seems to be the only currency.
To counteract his negative, loser self-talk, he would have needed a redemptive exposure to Christian religion. Going to Sunday School and church with a family and the repeated messages of hope and renewal, not even to mention a cultural ideal of sexual continence, might have pulled this kid just enough back off the edge. Instead, his father got the loony idea, perhaps emulating Michael Moore, of doing a documentary about celebrities' ideas about God, and not only abandoned the kid even further by flying around the world to interview people on film about their personal (most likely rejection) of the traditional gospel, but also failing financially in making that flop and cutting off child support as a result. The father was a real jerk on almost every level, imo. At least he had the proper British decency to express condolences to the families of the victims. Whether he has a clue how he trashed the lives of his wife, son, daughter, mother, mother-in-law, second wife and second son remains to be seen.