Douglass wrote a left-wing hagiography of JFK, and then leapt from that premise to a fantasy of permanent global peace, if only JFK had lived (a nearly Messianic figure, in Douglass' recreation).
DiEugenio picks up the ball, and has JFK not only in peacefully concluding tensions with communist dictatorships, but siding with Islamists against Israel, also with incredibly positive results.
For those authors, the JFKA is not about an assassination, but a platform for their ideologies.