I think Bugliosi conjured up the "Helter Skelter" business in the Manson case to provide a narrative for that crime for the jury. It had little to do with his race war theory. Manson was attempting to cover up a drug-related murder by one of his associates by making it appear that the person responsible was still on the loose and committing similar crimes while his associate was in jail. The messages left at the crime scene were intended to make the police believe the crimes were all linked. Instead Bugs used them literally as a motive for the crime. My only criticism of his analysis of the JFK assassination is that he allows the CTers to drag the discussion down into the gutter. It is understandable to become frustrated at the lack of logic and insanity applied to the basic evidence in that case, but in the context of writing a book on the subject it makes him sometimes come off as petty when ranting against those nutty claims.
Wow! Never thought I'd say this but you're spot on with this, Richard, about the bullshit narrative Vince came up with about Manson. As you say, it was much simpler. And as well, Manson had a dream to be a singer and wanted to get revenge on Doris Day's son when he was turned down. Melcher had been staying at Cielo so he thought he was still there. And he had already crashed into Cielo weeks before the murders where he came across Tate and a photographer outside in broad daylight. And what few people realize is he had already cased the LaBianca home because he attended a party that the backyard of faced the LaBianca home.
But old Vince spinned his fantastical Helter Skelter take over the world yarn. Talk about a conspiracy theorist!