The other sweet thing about letter-form arguments is that there's only one recipient. In forums you have throngs of yokels itching to have their own say even when they have nothing to say. A writer like this Holt fellow would be reduced to gnashing his teeth and pulling out his beard in today's public forums where a good number of well-placed "LOL, FAG!" and "Yeah well I'm not listening so nya nya" comments would sentenced him to the death from a thousand paper cuts.
If professor Henderson wished to really reduce Holt, I think he could have done so in four letter: TLDR.
@Phaed - The chilblain tonic was hilarious. Top form.