I voted “none of the above” in Major Tom’s poll. That was because other options such as LBJ/Malcolm Wallace , Alpha 66, John Milteer Nationalists , KGB, Military Industrialists, and MK Ultra were left.
The 2 questions that I keep pondering are:
1. Why did whomever assassin(s) opt for killing JFK by shooting from a high elevation while JFK was a moving target in a limo with his wife next to him and JC and wife in front of him?
2. Why did the assassins choose Dealey Plaza and TSBD as the high elevation spot to shoot from?
The simple answer is that Oswald, a kooky Marxist who owned a bolt action rifle saw an opportunity when he read in the newspaper that the motorcade route would go past his place of work, the TSBD, in Dealey Plaza.
To answer the same 2 questions from a CT perspective requires more complex speculations such as that the mastermind conspirator(s) must have really hated JFK with a passion. He/they opted for a spectacle killing by rifle fire in Dealey Plaza because he/they desired it to be filmed and photographed from all directions.