People who promote myths are seeking an audience and want money.
Kennedy assassination: There was a twenty-two-hour mock trial created by London Weekend Television in 1986, with attorneys Vincent Bugliosi and Gerry Spence, a real federal judge and a Dallas jury. Don argues that watching it resolves doubt that Lee Harvey Oswald was the sole perpetrator.
Moon landings: MythBusters addressed the naysayers by reflecting a light signal from Earth to one of several retroreflectors left on the lunar surface by Apollo missions.