Masters of propaganda from its inventor, Jewish public relations expert Edward Louis James Bernays, to the Nazi Minister of Propaganda Paul Joseph Goebbels, agree that a lie can be turned into truth by constant repetition.
The purer the lie, the more complete the success in turning it into The Truth. Lies partly based in fact or half-truths open themselves to factual challenge. For a propagandist the best lie is a lie unfettered by even a distant relationship to truth. Such a lie can be turned into such self-evident truth that no evidence is necessary. As Nikki Haley and Hillary Clinton put it: "Evidence! We don't need any stinking evidence. We know Russia hacked our election!"