I'm personally convinced the Kennedies and Martin Luther King were assassinated by a right-wing plot, but, as you say, that's a can of worms that will wriggle on for ever, which is why I haven't much time for it. Either something will pop up out of archives J. Edgar Hoover forgot to clean (dream on), or some aged whistle-blower will finger the culprits, or the worms will wriggle on...