Ironically, for all of their love of conspiracy theories — the rigging of the 2000 election, vote suppression in Ohio in 2004, 9/11 being an inside job, oil companies covering up miracle technology that would allow cars to run on dirt, Britney Spears' career, etc., etc. — when presented with an actual conspiracy of Soviet spies infiltrating the U.S. government, they laughed it off like world-weary skeptics and dedicated themselves to slandering Joe McCarthy.
Then as now, liberals protect themselves from detection with wild calumnies against anybody who opposes them. They have no interest in — or aptitude for — persuasion. Their goal is to anathematize their enemies.

"McCarthyism: The Rosetta Stone of Liberal Lies" (8 November 2007).