By far the best article I have read about the "manifesto" of the Buffalo shooter is by Jeff Sharlet at Vanity Fair:
The Terrifying Familiarity of the Buffalo Shooting Suspect's Extremist Creed
Worth clearing your cookies to read it, if you have to.
Update: worth reading the Slate article on the Tucker Carlson attempt at deflection from blame for his promulgating the same racist theory that inspired the shooter (even allowing that the shooting never cites Carlson or Fox News as a source or inspiration):
Since taking over Bill O’Reilly’s old primetime slot in 2017, Carlson has come to embrace “Trumpism without Trump,” as the Times put it. That ideology, in Carlson’s interpretation, means a steady diet of paranoid nativism modulated by seething contempt for anyone who is not a paranoid nativist. In the world of Tucker Carlson Tonight, the terms “racist” and “racism” are almost only ever bestowed in bad faith by leftists hoping to chill public discourse and cow conservatives out of expressing and/or acting on their beliefs. And so it was both depressing and predictable that during Monday night’s show—his first show since the shootings in Buffalo—Carlson heaped scorn on those pundits and observers who had dared to suggest that the mass murderer who openly announced his own racism was, first and foremost, a racist.
In his monologue, Carlson argued that the top-line takeaway about Gendron should not be that he was racist, but that he was insane—and, implicitly, that the unsung villains of the Buffalo attack were the liberal pundits who had had the gall to connect two very obvious and proximate dots. “The truth about Payton Gendron does tell you a lot about the ruthlessness and dishonesty of our political leadership,” said Carlson. “Within minutes of Saturday’s shooting, before all of the bodies of those 10 murdered Americans had even been identified by their loved ones, professional Democrats had begun a coordinated campaign to blame those murders on their political opponents. ‘They did it!’ they said, immediately. ‘Payton Gendron was the heir to Donald Trump,’ they told us.”
A quick Google search for the term “Payton Gendron was the heir to Donald Trump” indicates that no one other than Tucker Carlson himself is actually saying those specific words or anything particularly like it. Likewise, no one credible is saying that anyone other than Gendron is directly responsible for the attack. Carlson surely knows this, just as he surely knows that his viewers do not particularly care whether or not the things he says are fair, accurate, or logical. What his viewers want is to be made to feel like they are the true victims of every real or imaginary outrage that makes the news.
On Fox News, and especially on Tucker Carlson Tonight, the scariest attacks are always those being systemically waged by liberals on conservative values. Even in the immediate wake of a definitional racist massacre, committed by a person whose stated ideology was not entirely dissimilar from ideas that are routinely voiced on its own airwaves, Carlson could not help implying that the real victims here are, perhaps, the conservatives whose speech might be trammeled by liberals hoping to capitalize on the shooting for their own political end
“So, what is hate speech? Well, it’s speech that our leaders hate,” Carlson said on Monday night. “So because a mentally ill teenager murdered strangers, you cannot be allowed to express your political views out loud. That’s what they’re telling you. That’s what they’ve wanted to tell you for a long time.” Implicit in this response is the argument that while Gendron’s views and Carlson’s views share a lot of overlap, it would be unfair to criticize Carlson for holding and professing those viewpoints, because, in this construction, the racist opinions and the racist violence are not directly linked. (This sidestep ignores that white supremacist ideology is inherently violent.) While the host, in part, was deflecting, the deflection was also a force of habit. The meta stories that Fox News has always liked to tell when the actual news is inconvenient or unpleasant for the right have, over time, become virtually the only stories that the network is able to tell in an era when the Republican Party is at its moral nadir.
It ends:
In a humane and functional polity, our top political leaders and opinion-makers would want to promote a responsible, fact-based discourse; would see nothing controversial in acknowledging hard truths about American history and in condemning racism in the past, present, and future; and would generally try to avoid voicing and normalizing the sorts of spurious cultural grievances that might ever motivate some crackpot to go shoot up a supermarket. This is not the polity we have today. Instead, we’ve got one where spurious cultural grievances are the only grievances worth nurturing, a world where the only people worth directly condemning are those who dare to call racism by its name. The dead, like the truth, are merely collateral damage.