I've always been open to the axe falling wherever it should in the JFK assassination, because even from the tender age of fourteen or whatever I was then, I could never understand why considering the possibility of a conspiracy was any more heinous than that of a lone nut pulling it off.
Back in the early 70s I got into it for a bit, and I read Mark Lane's books and one called Six Seconds in Dallas -- both of which seemed to make the most sense as far as analyzing the evidence and pointing to what should be investigated. I also read the long Playboy interview with Jim Garrison, which I found fascinating but I was never able to fully connect the dots. I liked the JFK movie, but I didn't understand why Stone became so obsessed with Garrison's obsession...as opposed to any other. I suspect DR Elmore's take is pretty right on.
Stone's kind of a nut, himself, of course, but I do like some of the movies. He did aim wrong in this one, I think, even if it's a good film. I liked Nixon more, but everything surrounding Nixon is so well documented that he could hardly go wrong. (Haven't seen it in years, so maybe he did go wrong in that one, too, and I'm totally forgetting.)
Oh--another mid-70s influence on me was Mort Sahl's publicizing the Zapruder film and all the questions surrounding that.