Despite my clearly leftist politics, I have never "objected" to Nixon as much as many and I believe that he has been unfairly vilified. He wasn't a "great" president by any means, but in comparison to Reagan, George W, and the clown car of wing nut nihilist crazies who call themselves Republicans these days, Nixon was a saint.
I have a better opinion of Stone than you. His film portfolio has been up and down, but to me all that proves is that he's willing to take a chance on some offbeat topics unlike people like Lucas, Spielberg, Cameron, and others who go for the safe blockbuster epics with lots of mainstream Hollywood backing.
Many of his films are near masterpieces and don't have a "conspiracy" orientation.... they're just damn good stories that often push a particular sociological or political point.....
W
Nixon
Natural Born Killers
Born On The Fourth Of July
Wall Street
Platoon
And of course, his recent documentary series, "The Untold History Of The United States" should be required viewing in every high school in the United States as an antidote to the hyper-nationalistic, militaristic, cowboys and indians distortions of global history that passes for US history to most Americans who get their information from faux news and talk radio.