JFK Revisited is the short version of the four-hour documentary JFK: Destiny Betrayed. Thankfully, the short version leaves out most of the liberal preaching found in the long version. The long version contains a lot more material on each subject than does the short version, but the long version also contains an unfortunate dose of ultra-liberal politics.
Conspiracy theorists need to understand that you do not have to be an ultra-liberal to regret JFK's death, to reject the lone-gunman theory, and to admire the good things that JFK did as president. Sadly, most conspiracy theorists act like if you believe JFK was killed by a conspiracy, you must also believe that the Vietnam War was evil, that JFK would have done nothing to prevent the fall of South Vietnam, that the CIA should be abolished, that Edward Snowden and Bradley Manning are heroes, that even Obama's anti-terrorist drone program was wrong, that the PATRIOT Act was a tyrannical violation of constitutional rights, that Reagan was a bad president, etc., etc.