I have seen Dealey Plaza myself and I have no doubt that untold thousands of individuals with a little practice could make that shot. Then, I believe in Ockham's razor. Plus, how many individuals would have to keep a JFK assassination conspiracy a secret?
It is too ludicrous to consider. I feel sort of sorry for those that cannot work that out in their own minds. Some people watch too much TV and probably think The Bourne Identity was real.
What, precisely, was Oswald's motive? What was his purpose in going to Mexico? What was Oswald's plan after shooting Kennedy? Why did he go from the TSBD to the Paine house, shoot Tippit, and then to the Texas Theater? Why didn't Oswald surrender at the scene or go directly to the Greyhound station near the TSBD so as to leave town? Are we really to believe that mob associate Jack Ruby shot Oswald because of a sudden patriotic impulse?
Granted, like the middle of a bad detective novel, we seem to have too many plausible suspects. In the 70s, the House Select Committee on Assassinations concluded that Oswald shot Kennedy as part of a plot that involved the Mafia, motivated by Bobby Kennedy's attacks on organized crime and the Teamsters. At least two Mafia figures (Johnny Roselli and Sam Giancana) turned up dead just after being identified as witnesses by the HSCA. Pure coincidence? Then why does a friend of mine who is from Tampa and related to Santo Trafficante confide that "Uncle Santo" was involved in the assassination?
Later revelations about CIA financial support for a violent Cuban emigre group led Robert Blakely, the former HSCA staff director, to urge that the investigation be reopened. As Blakely saw it, the CIA had lied about its role in the events leading to the assassination.
One Cuban exile who worked for the CIA (Antonio Veciana) claimed that he saw his CIA contact talking with Oswald before the assassination. A session with a sketch artist led to the disputed identification of senior CIA officer David Atlee Phillips as that contact, under the cover name of Maurice Bishop. Based on private information of absolute reliability, I know that identification was correct.
Of course, there are connections to LBJ as well. For a grand unified theory of the assassination, we have E. Howard Hunt's tape-recorded deathbed confession to the effect that he was a benchwarmer in the JFK plot, which originated with LBJ and relied on the Mafia and the CIA.
As Kennedy's trip to Dallas was being planned, LBJ learned that he was going to be dropped from the ticket and prosecuted for corruption arising out of the Billie Sol Estes case. Funny how that worked out. Was LBJ just lucky that day in Dallas, with his course being redirected from prison to the Oval office? For motive by the CIA, it should be noted that Kennedy smoked marijuana and had daily meth injections, engaged in compulsive, reckless womanizing, which included an East German agent, had improper contacts with the Soviets, and secretly agreed to protect Castro and to eliminate US nuclear missiles from Turkey. In the context of the Cold War, this suggested high treason or at least a lack of fitness for office.
I make no claim for certainly as to what happened in Dallas beyond a deep distrust of the Warren Commission and its conclusion that Oswald was the lone gunman. There is too much that points toward a wider conspiracy.