`  The problem with the title is that it refers to something that isn't backed up by most of the reliable sources cited.  The only real source for the theory expressed in this title is Valentino; thus as I suggested before, a better title would be something like Valentino's theory of mass killing or some such.  Other sources are connected if we make the title Mass killings in the Soviet Union, China, and Cambodia, that way we don't have to have the sources all agree that it is communism or totalitarianism or democide or whatever that is at the root of all this.  It's true enough that these three examples are cited by different authors together.  But some of the editors here seem wedded to making this article express a political theory about ``communism`` that just isn't backed up by the sources.   `