John Simkin, founder of the Ed Forum, posted this today:
"An interesting question for those who still believe the 'lone gunman theory' is what kind of evidence that was provided to them would make them change their mind about the subject."
I would need something (1) unequivocal that is (2) directly tied to Dealey Plaza. An absolutely authentic, no-question-about-it document from the CIA, FBI, Mafia or Whomever that predates the assassination and clearly refers to "our patsy in the TSBD," "our sniper in the Dal-Tex Building," or something of similar import. Or even a similarly no-question-about-it document in Oswald's handwriting that specifically and unequivocally refers to some conspiratorial plot.
The evidence has been scrutinized by too many highly qualified people who have reached the LN conclusion for me to ever be swayed by yet more speculation, especially speculation that has nothing directly to do with Dealey Plaza and 11-22-63. There is not some "tipping point" where I'm going to say, "Well, that does it. The innuendos and speculation surrounding those 12 documents have put me over the edge into conspiracy world" (or even, "Yes, the doubt about the SBT has now reached a sufficient level that I must plant my flag in conspiracy world").
I mentioned before that a longtime CTer who encouraged my efforts at the Ed Forum once said to me privately, "Sooner or later, John Newman is going to have to bring it to Dealey Plaza ... but I doubt he ever will." No, he never will. He'll continue trying to reinvent Oswald as the Most Interesting Man Who Ever Lived.
CTers need a theory in which Dealey Plaza makes sense as a real-world, Presidential assassination conspiracy and at least one piece of absolutely authentic, no-question-about-it evidence. Then I might be swayed.
That's why I'm always referring to "ad hoc" CT theorizing. CTers are stuck with the inconvenient reality of Lee Harvey Oswald, Dealey Plaza and the messy aftermath - and none of it can be fitted into a real-world, Presidential assassination conspiracy theory that makes any sense. When we start asking how it would have made sense, both in broad conception and at each stage, we understandably get crickets.
Hence, I would require something like the level of evidence that would convince me the Apollo moon landing was fake.