Nice quote about "selfishness is human nature" from Harman in "How marxism works"

People’s ideas are intimately linked to the sort of lives they are able to live. Take, for instance, ‘selfishness’. Present day capitalist society breeds selfishness – even in people who continually try to put other people first. A worker who wants to do their best for their children, or to give their parents something on top of their pension, finds the only way is to struggle continually against other people – to get a better job, more overtime, to be first in the queue for redundancy. In such a society you cannot get rid of ‘selfishness’ or ‘greediness’ merely by changing the minds of individuals.

edit: read theory, comrades, it is worth it.