But who in the world would ever keep their mouth shut about having been part of the plot to kill Kennedy?
As my grandfather used to say “There's always squeakers and croakers’’.
It would come down to how many people knew. I agree that huge conspiracy theories that require the silence of hundreds or even dozens simply aren’t realistic. That many people and someone is going to talk.
But, if you can pull this off with a handful of people, well....that’s a different story.