Politics is an important domain to which we should individually apply our rationality—but it's a terrible domain in which to learn rationality, or discuss rationality, unless all the discussants are already rational.

The purpose of LessWrong is to discuss and learn rationality, so I think politics are almost never appropriate here. But even if we think that civilized discussion of political matters is appropriate, the post I was critiquing was not, IMO, up to our standards of civility and polite discussion.