Possible idea for a new sub forum.

[Touchstone]

The closest that he could get was the same as the phrase made famous in the 1950's Joe McCarthy "Red Scare" trials. "I know it when I see it."

Your points are well taken, but to nitpick a little: "I know it when I see it" is best known from the 1964 US Supreme Court case in which Justice Potter Stewart declared he couldn't define "hard core pornography" (with the implication that everyone else could say the same thing). Maybe that makes it even more relevant. Not aware of any connection to the Red Scare era.