Found his manifesto (reupload from his now deleted channel).
View attachment 3457038
Judging by the hand drawn characters and edgy animation, this guy strikes me as a Randy Stair type of guy, aka the Danny Phantom tranny shooter.
So yeah, retarded loaner who spends all day watching anime, decides to punish society for not recognising him as an artistic genius. This is guy is a grown man but still acts like he's some bullied loser in high school. Clearly he never grew up. I suspect he still blames his time being bullied for his problems now, and probably fixates on getting his revenge. This is kinda just inferred from the amount of classroom and high school imagery in the video.
He wants to go down as some heroic victim who lashes out at the society that made him, because he spends all day reading superhero comics and he thinks that is what people will respect. Found our Joker 2019 shooter. His whole manifesto is begging people to view him as a sympathetic figure. But if you were mentally well enough to make this vid, there was no way that this was a scitzo thingy.
Trial predictions: He will 100% regret it. He's some spoilt faggot who wanted attention. And when he realises that he might spend the rest of his life getting bum raped for no reason at all, that cool emo persona will vanish in an instant.