"And JFK didn't plot to kill Diem. CIA did have contacts within the group that plotted the coup, but it was not a CIA plot, and they reported the information to DC. The decision was made at "the highest level" not to warn Diem. Somewhat similar to what happened to Allende a decade or so later in Chile."

That's accurate, Larry. I think it would also be accurate to say, on the evidence, that JFK was complicit in the despot's death. The "highest level" Looney Tooney, can't-shoot-straight attempts to kill Castro didn't produce the same results.