Florence King gives us a basic lesson in lethal civility at National Review, by taking down Ann Coulter. With a stiletto rather than a sledgehammer.
As the 'Sicilian' proverb goes: The only real way to win an argument is to put your thumb on the blade and thrust upwards. The ideal is to find that one smooth motion that strikes to the heart of the matter, not to pound at the other side (and, inevitably, be pounded back).