X: That's the real question isn't it: why? The how and the who is just scenery for the public. Oswald, Ruby, Cuba, The Mafia, keeps 'em guessing like some kind of parlor game, prevents 'em from asking the most important question: why? Why was Kennedy Killed? Who benefited? Who has the power to cover it up? Who?
David Ferrie: Oh man, why don't you fuckin' stop it? Shit, this is too fuckin' big for you, you know that? Who did the president, who killed Kennedy, fuck man! It's a mystery! It's a mystery wrapped in a riddle inside an enigma! The fuckin' shooters don't even know! Don't you get it?
Dean Andrews: Kennedy's as dead as that crab meat, the government's alive and breathing. You gonna line up with a dead man, Jimbo?
Answer: No. The argument which mentions was the first closing argument by an assistant to Garrison and in it he mentions "back and to the left" once but not the multiple statements shown in the movie. The actual transcripts are available on line.