Since you mentioned McKay
I've been doing a separate series on my column on the films of Aaron Sorkin (the screenwriter) and this was is more pertinent.
I'm not entirely sure about Stone's sanity: in his Untold History of the United States (which was a full ten part series on leftist propaganda) he basically accused every President from FDR are on being part of the process of American Empire. Guess who he left out. yES, he still believes Kennedy was killed by the CIA because he was going to pull us out of Vietnam in his second term and yes he still is ignoring the fact that Bobby told the world that based on the information they had at the time, the sainted Jack would have done the exact same thing LBJ did. He's pull blown contrarian conspiracy nut at this point, albeit one who recognizes great movies. (He acknowledged that Oppenheimer was the kind of movie he wished he'd made.)