Bugliosi is a smart man. For one thing, he knows conspiracists are crackpots, including the Truthers, and said that such beliefs are pure poison that will wreck people's lives.
We got the conspiracy meme from English law. What's ironic is that much of American legal code deals with the various crimes that surround conspiracies, yet mere citizens that voice their observations of obvious criminal groups operating in public (and on the public dime) and in concert are smeared as crackpots.