"If only it were all so simple! If only there were evil people somewhere insidiously committing evil deeds, and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?"
-Aleksandr SolzhenitsynHat tip to Zero Hedge for the quote.
Robert Conquest's Harvest of Sorrow was another work, also focused on the Soviet Union, that really takes the shine off. Our species that is. You can also add Wild Swans by Jung Chang and sand off the finish.