Stone hasn't been relevant in decades. I didn't even realize he was still alive. I do give him some credit for at least questioning the government even if he makes a fool of himself. Something most of his kindred will no longer do. In fact, they advocate censorship and worse for anyone who dares to question any official explanation.
Stone doesn't question US government policies, he's hostile to them. Every single time. He uses the same thinking on American foreign policy that he does with the JFK assassination: that is, conclusion first - a conspiracy happened/the US is wrong - and then finds facts to support those views.
It's a judgment first, facts second world view. Is there a single US policy that he doesn't think was wrong? Just one? He thinks that if the US elected Henry Wallace as president in 1948 that the Cold War wouldn't have happened. Even though Wallace himself later admitted that his views about Stalin and Moscow were completely wrong, that he was duped by the Soviets (several of his campaign advisers were actual Soviet agents including one John Abt; yes, Oswald's Abt). Likewise, is there a single
people piece of evidence that he thinks implicates Oswald? Just one? Answers, no and no.