Where Bugliosi got these direct quotes is anybody's guess. His fevered imagination? As shown, his footnoted sources aren't it.
Bugliosi loses credibility by using brainwashing techniques.
Emocional blackmail: Only a fool could believe that Oswald didn't do it ...
Then dramatising as in your example or using his "authority" through his position makes him difficult to read.
Talking to us rather than talking down to us would have been much better ...