The old apologist nugget of citing people like Pol Pot as example atheists is tiring, annoying and, to me, simply not relevant. Cults are cults regardless of whether they worship spooks or terrestrial demagogues. It is the same idiocy, just different spots.
But I had a minor epiphany just recently that can be used to throw back into the face of the next god-freak that plays the Pol Pot card on you -
: Pol Pot became leader of Cambodia in mid-1975. During his time in power, Pol Pot imposed a version of agrarian collectivization, forcing city dwellers to relocate to the countryside to work in collective farms and forced labor projects, toward a goal of "restarting civilization" in a "Year Zero". Jim Jones
: Jones had first started building Jonestown in 1974 as a means to create both a "socialist paradise" and a "sanctuary" from the media scrutiny which had started in 1972. Regarding the former goal, Jones purported to establish Jonestown as a benevolent model communist community stating, "I believe we’re the purest communists there are."
Both citations are from Wikipedia and therefore lies. Still, it's an interesting, and useful, trick to keep up your sleeve should you get entrapped in an argument with a theotard.