FWIW - Most famous killer "manifestos" or "real" motive rants are just word salad at worst (David "Son of Sam" Burkowitz, Charles Manson) or the ramblings of a narcissist in denial they did anything wrong at best (Ted Bundy, John Gacy).
The only one who might, MIGHT have bucked the trend and come close to the deep and better-than-Nietzsche dream of Hollywood psycho-philosopher was Ted Kaczynski. While ol' Bombin' Ted certainly had the IQ and academic cred to pull it off, and some people really do think his treatise on Industrial Society is worth anything beyond it's author's notoriety. But the truth is any number of a thousand sociologist undergrads or regular folk could write the same thing in a weekend with a thesaurus.
Besides, any smarts he allegedly had on the workings of humanity and the fate of the planet are nothing when weighted against the fact he was dumb enough to think that randomly blowing up a commercial jet, campus faculty, a computer salesman and a timber industry exec would alter the course of history and put everything right again.
His "manifesto" is nothing but a drawn out Twitter rant.
It's a rant, because that's ALL a narcists can do: they're all just rants about how they haven't been given ENOUGH for their suffering/smarts/worldly contributions.
Which is why Bob is so detestable, he's not just a narcist, he's a profoundly lazy one, can't even write a "proper" turd-polishing manifesto, or get up the nerve/effort to get off a couch and and least feebly TRY to punch a Nazi. Oh, but he can call you stupid on social media, and considers that mission accomplished.