David Horowitz, It's a War, Stupid:
Whittaker Chambers long ago warned that the source of the Left's strength was not the appeal of its theory, but the power of its faith. It is believing in something worth dying for that makes leftists a formidable foe. Reason and experience are neutralized by the Left's preening assurance of its own rectitude and of being on the side of the angels. It never has to explain how its efforts to create economic "justice" and plan social abundance have blighted the lives of hundreds of millions of human beings and caused mass murder on an epic scale. The radical faith has outlived "the end of history" and the fall of the Berlin Wall. The ideas that inspired its odious schemes continue to thrive because there is only one law that the Left obeys, a law on which its survival is based: don't look back. Reactionary in ideology, immune to evidence, impervious to logic, the Left still sees itself as forward-look-ing and humane and its opponents as regressive and "mean spirited."