Sadly, the mentally disturbed have always been among us. People who believe that Hitler escaped unharmed from Berlin, that Elvis lives, that the Earth is flat, and that the moon landings were faked in a studio are never going to go away. There were there long before most of twigged that our governments and the media are pathological liars, and they will be there long after. Unfortunately, they serve a purpose for the media, which is always happy to feed them with the oxygen of publicity; they might, after all, provide a distraction for the genuine scandals that actually do take place the world over.
My sympathies go out to the victims and their grieving families. It must make their suffering a thousand times greater than it already is.