He ain't notable enough for a simple biography.
His manifesto would be cut in half by any semi-professional editor. I suspect it could be usefully reduced to a third in size.
The major lesson here is about mental heath and societal support systems. Alienation? Social isolation? Pain of rejection? All cliche. Walk into any homeless shelter and listen. It's all there. His story ain't nothing unique. People who identify with what he has to say willfully overlook key parts to his story in favor of his poorly articulated rage dump. The key parts aren't missing. Many an article, blog post, and essay thoroughly covered all the facets.
Desire you an expose of a self destructive life with keen observations on the nature of society and all its imposing faults, well exposed, and well said? Study Bukowski. Study John Horne Burns. Misfits from two ends of the social scale make for an enlightening comparison.
Finally, who would be the market for such a book? Our tiny niche of people most interested are also those most able to scan and file-share. That's assuming, by some miracle, a deal could be made to land copies on the dead tree graveyard of brick and mortar bookshelves. Not much left over for an ambitious counter cultural writer to live on even if money should change hands for every ebook read.
No thanks. I'll stick to writing made to order erotica.
