Bill, that is a circular argument of sorts! A dog chasing it's tail never catches it!
In the meantime, if you have evidence revealing that anybody but the shooter knew there was to be an attempt made on Kennedy that day, by all means do post it.
Don't sidetrack. Answer my question!! How can you conduct a proper investigation of any event if you are in charge of it, part of it and are investigating yourself even though you were part of the crime scene? Think about it. If you are in charge of the entire investigation (of yourself nonetheless), how is the process not biased?
A proper investigation would have involved an independent inquiry into his death, something which was circumvented by those SS players involved. By removing the body, vehicle etc. out of the hands of the Texas jurisdiction, you are bypassing protocol and the rule of law! That is what happened in this case! Why not let a standard lawful investigation run its course. If you are innocent, you have nothing to fear by the process. However, if you are guilty, I guess you don't want that investigation to take place!
The conspiracy comes in from the fact that you allow Greer and Kellerman to be part of the investigation team. These are possible suspects. These were people at the very crime scene! Post independent agents instead. How did the "Navy Corpsman" get in there with a camera and then have his rolls of film destroyed? Who was controlling this scene? We know who was controlling the crime scene and it certainly wasn't the President!