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In page Manson Family:

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There are alternative theories to the Helter Skelter scenario and whether or not it was the actual motive behind the murders. According to Family associate Bobby Beausoleil, it was actually Beausoleil's arrest for the torture and murder of Gary Hinman that instigated the Family's ensuing murder spree—enacted to convince police that the killer(s) of Hinman were in fact still at large. This has been substantiated by interviews of Beausoleil by Truman Capote, and by Ann Louise Bardach in 1981.[1]