I expect it is highly likely with JFK, RFK, Martin Luther King, Malcolm X that the person(s) who pulled the trigger were merely the immediate cause. Crimes such as these rarely exist in a vacuum and there are most likely deeper levels of involvement (FBI, CIA, etc.) involved in the planning and execution. I wonder if final release of files will shed more conclusive light?
Or could it be just one man on a mission, followed by a lot of messed up stuff?