I think he was INFJ 4w3, and of course an extremely unhealthy one (ie. emotionally/mentally/spiritually ill).
I am confident in this typing after reading his manifesto.
I made the following post on another board, and it just scratches the surface of why I believe that to be his type & why I think he is "typable" (ie. not so insane he cannot be typed). This includes other points I was addressing in that particular thread, but I'm keeping it in context as I think it's necessary to in order to make the case for his type.
My post:
After reading this guy's "manifesto", I think (emphasis on this being my opinion expressed on an internet forum):
- He had no mental illness as far as a "disease" that he could not control, IMO. I think he was sick in the sense that he had developed very unhealthy thought patterns & behaviors. He indulged in this. No one is to blame for these choices of his; this mental sickness was a choice & "bad habits" he developed, not a disease that arose from his genetics or severe childhood trauma. He sounds like an extremely sensitive person who dwelled on teenage teasing that was pretty normal (while not right, it's the kind of stuff many go through & come out just fine) to the point where he entered almost every new situation with the belief it would not change, especially as he believed the fault to fully lie with others. In carrying this belief with him, he self-sabotaged & adopted behavior & thinking that kept the cycle going. He fed & nurtured his hurts & dwelled distorted thoughts & sought info to confirm his biases until they grew more extreme.
Basically, he was a nice looking kid from an upper middle class to upper class background who had some bullying at school & social awkwardness, and he chose to take a mental, emotional & behavioral path that focused on these relatively few hurts (compared to the lives of others), which then put him in a negative cycle. He had a lot of positive things he could've focused on (parents who seemed to love him, even if they ignored him a lot; male friends who did accept him, even if they were nerdy too; and a very comfortable financial/social background, even if he thought it was "embarrassing" to live in an apartment for a short time when his parents divorced; physically healthy, even if shorter/skinnier than some peers), but he chose not to see those things.
- His parents were not bad or abusive, but neither were they good parents (from how his manifesto paints them). They sound like they were very wrapped up in their own lives during a time period he really needed them. By his pre-teens, his parents divorced, his dad was busy with his film career, and no one seemed to notice he spent excessive time playing video games, failed classes at school, and was being bullied by classmates. Parents who allow their teenage son from age 12-18 or so to play WoW for 14 hours a day are not great parents. Parents who have no idea their son has extreme emotional anguish in response to daily bullying & begin a social outcast are not great parents. Good parents know what's going on with their kids & play an active role to make sure they aren't computer game addicts with inability to interact with peers.
- This is not really about sex & pent-up aggression due to no outlet for sexual release. This is why arguments for legal prostitution make no sense (& prostitution exists, even if not legal where he was from; his situation wouldn't have made it hard for him to discreetly find & pay for a call girl. There is also such a thing as craigslist personals). The real issue: He had a preoccupation with achieving social status before puberty even. He was angry when this failed, and especially angry with female peers who teased him. The sex & women part, IMO, was a transfer of his general desire for social validation & sense of being rejected/inferior into a very specific area which became the focus upon puberty. "Getting girls" would signify this to him, whereas buying sex via a prostitute would not. His interest in PUA confirms how this was mostly about women being a commodity, one that signaled social value if you could obtain it.
- I think he was an extremely unhealthy INFJ 4w3, filled with envy & hostility & a sense of defectiveness he turned into a self-fulfilling prophecy. He speaks of a happy childhood, happy times now lost, and focuses on what he is lacking in life over what he has. 3 wing is obvious - he's preoccupied with having a successful, attractive image & believes in this image, with anger aimed at those who don't "see" it.
Inferior Se & weak aux Fe is all over his manifesto. Most of his attempts to "fit in" socially when young revolved around social status & visual image, not real social skills. He tried to create a cool skateboarder image but failed, partly because he could not skate. He viewed popular peers as competition towards his goals. He felt his body to be small & weak, less masculine than his peers. IMO, these & many other details point towards inferior Se - someone who has difficulty impacting reality & creating a tangible presence with others. He turned to an intricate fantasy world in WoW where he felt safe & comfortable because he didn't know how to translate his vision of himself into a reality. He formed an ideology (a "vision") & then later a strategy to carry it through (Ni & Ti thinking). Like most unhealthy INJs, he believed the flaw in the rest of humanity, not himself. He considered himself polite & gentlemanly, & seemed able to convince authorities of this (weak Fe, but enough to pass as stable at times). His complaints are less about people being stupid or unable to think for themselves (which would be T-ish) than people being brutal & insensitive (more F-ish whining). Anyway, I could do a longer examination of his manifesto & how his personality comes through, but suffice to say I do think he was INFJ & not ill in a way that he could not be typed.