The apparent inconceivability (in this thread) of the notion that someone might disagree on a deep level with local memes without being insane is quite amazing. Typical mind fallacy, the lack of realisation that there exist unknown unknowns.

I considered posting a third-hand account in the rationality quotes of a blind couple who, in a public park and not hearing anyone else nearby, decided to have sex. They told the judge they did not know that anyone could see them; maybe they didn't, what with plausibly having no idea what vision is capable of.

It felt too lengthy, and it wasn't originally intended as a parable, so I decided against posting it. I think it more easily explains itself in this context, though.