What do you believe communism is and how do you believe it goes counter to human nature? It's an impossible thing to discuss without nailing down exactly what it is you are talking about as most people haver wildly diverging ideas of what it implies.
But most people seem to tend to think that communism requires some kind of pure altruism to work (and to be fair, there have been socialist and communists that also believed that), but a central aspect of Marxism is the opposite:
The working class must learn to value its own work and not buy into the subjective moralism of the capitalist classes (that tend to ascribe virtue to wealth: if you're rich, it is generally assumed to be an indicator you have worked hard, while poverty equally is suspect), but be willing to grab the proceeds of their labour. Marx spent a considerable amount of time ripping to shreds early "utopian socialism" (Fourier, Owens et. al) for failing to understand this amongst other failings.
The very insistence of revolution as the mechanism for social upheaval in Marxism is explicitly that Marx did not believe that the ruling classes would be willing to give up privileges willingly even in the face of election defeats, and so once a sufficient working class majority comes into being, sooner or later there would be conflict.
An egalitarian system according to Marx is a desirable, advanced stage of society, but it will come into being, he argues, not because it is the right thing, but because it is the only possible next step: the working classes can only overcome the power of the capitalist classes through sheer numbers, and can unite only because capitalism eventually creates a situation where carving up the pie equally becomes a net improvement for a rapidly growing majority: The rational choice for most of us to maximize our own wealth is an equal distribution the moment the majority of wealth is health by a minority of people, because most of us will otherwise be in the majority that receives less (and for this reason he was insistent that a socialist revolution would fail if attempted somewhere not advanced enough to allow redistribution to eradicate poverty - if it instead merely spread poverty out, class struggles would resume).