I've always believed Cuba was glad to see Oswald kill JFK. I think there are factions in government that believe Cuban fingerprints were on the assassination. And why, of all our old enemies, do we still refuse to acknowledge Cuba ?
I, unfortunately, have first-hand experience with JFK conspiracy buffs including one of the bestselling authors on the subject.
It's the contention of conspiracy buffers that Castro is, and has always been, a red herring to divert attention from the CIA and/or Texas oilmen (including George Bush "41").
The hardcore conspiracy people are Leftist kooks so they want to believe it was Republicans.
Evidently including Alexander Haig, Reagan's Secretary of State...
Haig's willingness to testify in the documentary can't be ignored -- it's a powerful support for its veracity.