I don't think theres really any doubt that the Kennedy assassination had an elaborate coverup to conceal who really did it. I've been to the book repository in Dallas and looked out the window, and where it doesn't seem impossible, it at best is very unlikely.
Like most people who believe in the conspiracy, I also think that it was a collaboration between the U.S. military, the Republican Party, and weapons contractors, whom of course have been in bed together ever since.
I also think this was a turning point of American history from which when the American Empire is looked back upon will be decisively where things went wrong. I always look at "hippies" with angry eyes because they where there when it happened, they where living in the moment that I couldn't touch and they didn't put a stop to it.
I always remember the Hunter Thompson quote:
"And that, I think, was the handle---that sense of inevitable victory over the forces of Old and Evil. Not in any mean or military sense; we didn't need that. Our energy would simply prevail. There was no point in fighting---on our side or theirs. We had all the momentum; we were riding the crest of a high and beautiful wave. So now, less than five years later, you can go up on a steep hill in Las Vegas and look West, and with the right kind of eyes you can almost see the high-water mark---the place where the wave finally broke and rolled back."