http://en.wikipedia.org/wiki/Fisking points out that the style of rebuttal had been common on Usenet for years, there just wasn't a word for it until 2001. I don't think most people are familiar enough with Fisk to give it any political connotations.
I agree he should stop trying to make "idiotarian" happen and it's completely out of place in the File.
From the ESR Jargon File: "Named after Robert Fisk, a British journalist who was a frequent (and deserving) early target of such treatment." He was "deserving" because warbloggers like ESR hated him.
I agree he should stop trying to make "idiotarian" happen and it's completely out of place in the File.