Are you sure primitive communism is predicated upon the benevolence of human beings? This doesn't seem obvious to me.
No, but the truth-condition of my statement isn't the logical necessity of primitive communism being predicated upon the benevolence of human beings, but the empirical reality of whether the Marxists/early Marxists entertained such a belief. I'm pretty sure that they did, at least by implication, but proving that would involve more reading than either of us would be willing to do, I'm sure, lol.
Apart from this, it would be easy to imagine some game-theoretic conditions whereby 'primitive communism' was the 'rational', 'self-interest-driven', result, and so no, I don't think that either intrinsic 'benevolence' or an intrinsic communal instinct is necessary for it.
I don't think so, but perhaps my phrasing of "suffering is intrinsic to human existence" was misleading. I think there is, roughly speaking, a distinction between what characterizes essence and what characterizes existence. If human being is defined as "inherently benevolent", this points to an essential characteristic of human being that it has in itself. That human being suffers, by contrast, is not characteristic of human being in itself but rather in the context of its existence, insofar as this existence involves impermanence, etc. What I would add, though, and which perhaps goes more in your direction, is that I'm not sure the Buddhist position (if I'm doing any justice to it with my words) is ultimately consistent, because it would have to account for why human being experiences impermanence in such a way as to suffer, whereas other beings presumably do not experience this suffering; and this seems to 'single out' human being in comparison with other beings.
Hmm, again we're coming up against empirical questions here, in that we need to be able to say that other conscious beings who experience impermanence do not suffer, and I'm not sure either that this is true or that we can readily find out the answer.
As to your distinction between essence and existence, here we seem to be back towards this idea of 'relationism' in tovlo's words, since I cannot imagine how the 'essence' of human being could ever be abstracted out from its existence/experience.
For example, take this thought experiment: is it possible to place a human being in something like a 'controlled laboratory condition' whereby variables are
removed? Suppose we tried to do this by having a person live out their entire lives in a blank white box - would we figure out anything meaningful about the 'essence' of human being as distinct from its various social contexts? It seems to me that it is not possible to
remove variables as much as set them to minimal levels.
Now imagine if we could design a scenario whereby
every human need was satisfied - would this person then experience suffering? If yes, then suffering looks like it's inherent to human essence; if no then suffering is only inherent to experience/existence. The former might look like Buddhism, the latter the 'Marxist metaphysics' imagined by the article.
I'm tired and waffling, but I hope you see what I'm getting at (which is to agree with you, I think).