Leftism is one grand, evolving lie. Leftist use all the tricks which Aristotle warned against - attacking premises by attacking the proponent; flattering particular groups; relying upon official "truth" as proof; and drawing false conclusions - and by these tricks, Leftists can support any particular branch of the Leftist lie for awhile. Leftist lies, masked as truth, are not immune to the crucible of human experience, but Leftist "history" is routinely filled with oceans of trivia and no inconvenient facts.