> Communism seeks to reaffirm the original principle - communalism - that
> differentiated humans from other species.
As I've said before, I believe there are species that better exemplify communalism than humans (e.g. ant colonies--and it's no coincidence that the workers who selflessly serve and defend the queen share nearly all her DNA). In human societies, we find that a high degree of kin altruism is a universal, and we also find that reciprocal altruism is a universal. However, the inclination to defect is also a universal. And so is competition. Does such a sketch (without further elaboration and support) show that communism is impossible? Not really. (To see why, one could misguidedly argue that the urge to defect would make capitalism impossible--which might've been true, if we hadn't created social institutions to punish cheats.)
-- Luke