The more closed a worldview, or - phrased differently - the more systematic and scientific an ideology is, the less it will be able to muster the pragmatism necessary to establish a hegemonic position. A worldview, a doctrine, a system in its pure form is never capable of hegemony. The capacity for hegemony contaminates thought structures. It manifests itself downright in the willingness to integrate other positions and ideologies.
Pessimistic Corollary: Ideological purity is a moral consolation price for those with no shot at power.
Conspiracy Corollary: Ideological purity is a device by 3-letter-agencies to divide the left.
Optimistic Corollary: Ideological purity is an essential requirement, as a means to inoculate a budding movement against the inevitable corruption and adulteration caused later by real life conditions, and to sow the seeds of a future enlightened society.
To quote David Salomon:
Pessimistic Corollary: Ideological purity is a moral consolation price for those with no shot at power.
Conspiracy Corollary: Ideological purity is a device by 3-letter-agencies to divide the left.
Optimistic Corollary: Ideological purity is an essential requirement, as a means to inoculate a budding movement against the inevitable corruption and adulteration caused later by real life conditions, and to sow the seeds of a future enlightened society.