A Darwinian Left
by Peter Singer (2000)
This slim but significant book offers a clear explanation of human nature by a progressive thinker. A key statement: "Belief in the malleability of human nature has been important to the left because it provided grounds for hoping that a very different kind of human society is possible. Here, I suspect, is the ultimate reason why the left rejected Darwinian thought. It dashed the left's Great Dream: The Perfectibility of Man". (p. 24)