"Jim - where exactly did you read about Amazon's response to a seller promoting/profiting on the manifesto of evil..."
The above reference is from Vox - the announcement that Amazon had the manifesto on sale appeared on the front page of 'The (English) Times three days after the shooting
The Times is a Murdoch bum-wipe but has an important enough reputation to protect not to invent news
Don't know anything about Vox   
Jim