There are plenty of articles out there about Vince's unethical tactics he used during the Manson case. He's the one that pretty much spinned the case into Manson being some kind of god-like leader to his followers. The true case behind Manson was he was a failed musician who thought Doris Day's son stood him up about working in the music industry, and the son actually lived in the house prior to Tate living there. Then Manson knew where the LiBianca's lived because he attended a party prior to their murder. The party house was I think facing the back yard of the LiBianca house. So much for Vince's story spin. Of course his book made him a household name so lending his name to the JFK book was going to give it great importance.
But about the Kennedy book, I read that Dale Myers was one of the ghostwriters of the book and had some kind of falling out with Vince. So there you go - a former CTer turned LNer who passed off an absolutely ridiculous and lying cartoon to the public back in the 00's about why his cartoon "proves" the LN theory. If you don't believe me, enjoy this funny review about it here on Speers' site:
http://www.patspeer.com/chapter12c:animaniaAnyone who thinks Kennedy looked like that with a giraffe neck would have to be truly gullible. But Myers is one on those writers who helped the millionaire write his saga about Dallas. I tried finding all of the links to all of this on the Kennedys and King site but that site sucks with being able to find stuff. But it's there so look it up.
To Bill Chapman - instead of asking others to cite things, which is a very lazy thing, why don't you roll up your sleeves and find things yourself?