It appears to me that one of the main things in the Capitalism Vs. Communism debate, depends on Human Nature, like is greed etc. innate or is it is conditioned (nurture etc.) by capitalist society.
So what does every one see as essentially human, are we just a blank slate or are we to a certain extent determined biologically and physically? How free are we and is the sum of humanity positive or bad, I mean are we good for the world or are we "a virus with shoes"?
Might right a dissertation on something like this (using people like Mill, Lock[sooo boring though], Rousseau, Hegel etc)