Also going to place my chips on the kid being someone struggling with finding his niche in life and potentially dealing with severe mental illness (that he was aware of or not, because
anosognosia is a hell of a thing). At 21~22 years old, when most people his age are graduating from university and beginning to settle into working life, he doesn't seem to have anything going on for himself. He isn't studying, honing skills or working toward building a career and his creative endeavors have more or less amounted to nothing. Probably not something that is very comfortable with someone with a fat ego who has aspirations of fame and attaining celebrity status with his mumble rap.
Looking at this picture here, I noticed what looks like old (seeing as they are quite pale) self harm scars on his forearm in the lower left corner...
His woo medicine, new age spirituality fan, "momtrepreneur" of a mother, strikes me as being absolutely unhinged (to say the least). Her wild-eyed lewd selfies, outlandish haircuts, obsession with spirituality and her risky driving gave me "I am in neck deep in a full-blown manic episode" vibes. Advanced stages of mania can have people losing touch with reality and believing that they have been given "special missions" from "entities or whatever. Some of his YouTube videos were strange in that he mentioned something about his "destiny to do something" and that" he couldn't be stopped".
Of course, it is more likely that he was just being an edgy creative type and spouting a bunch of purple prose. Even if his mother is not bipolar and he isn't mentally ill, stimulant abuse can produce psychotic symptoms in some people. Either way his brain was fried.
I do feel bad though. People were getting together to celebrate after a tough two years and then this guy decides to ruin everything. It didn't even look like a spur of the moment thing either, seeing as his social media history seems to point to this attack being premeditated.