How would you know what the backstory was since you never bothered to ask Seemed a bit emblematic of your true interest in looking into the question
Tell me why I would ask. I've already looked into the assassination and find for the prosecution.
If you have a plausible backstory that would produce a shooter able to supplant Dirty Harvey as main suspect, then by all means post it. And if you have additional information that would reveal that someone other than the shooter knew there was to be an attempt made on Kennedy that day, by all means post that as well.