This post is inspired by the recent Ziz-revelations posted here and elsewhere.
Chesterton Fence injunction: Do not remove a protective barrier unless you know why it was put there in the first place.
Schelling fence injunction: Do not cross a generally agreed upon guardrail, lest you end up sliding down an increasingly slippery slope, not noticing until it is too late.
I think a term like a Chesterton-Schelling Fence injunction might be useful: Respect an ethical injunction even if you think you know why it was put there in the first place.
A somewhat simplified example: There is a rather strong Schelling fence against, say, killing someone. Suppose the stated reasoning behind it is "God commanded so". Some day, you deconvert and start questioning the tenets of your faith, throwing one injunction after another, assuming you know why it was there, not realizing that this particular Chesterton fence is fake, the real reason is an unstated Schelling fence that has little to do with religion, but a lot with living in a society.
I said "respect" not "obey", because it is often hard to tell whether there is a hidden Schelling fence behind a Chesterton fence, and how strong the former is. Or vice versa. Or how many of the various hidden fences are there. Is it okay to cheat in an unhappy marriage? Maybe, maybe not, but noticing that this is an unsafe territory, that respecting the societal norms is generally a safe default, and that crossing it is likely yo backfire in both expected and unexpected ways can be quite useful.
I don't want to speak for Duncan, but that's not the meaning I took away from his reply. What I took away was that the received traditional wisdom often times is neither traditional, nor especially wise. Very many of our "ancient, cherished traditions", date back to intentional attempts to create ancient cherished traditions in the roughly 1850-1950 era. These traditions were, oftentimes, not based on any actual historical research or scientific investigation. They were based on stereotypes and aesthetics.
To return to the fence analogy, it's important to do a bit of historical research and try to determine whether the fence is actually a long-standing feature of the landscape or whether it was put up (figuratively) yesterday by someone who may not have known more about the territory than you.
EDIT: One common example is "blue for boys, red for girls". In the past, red was the preferred color for males, because it was considered to be more "active" and "energetic", as opposed to the "cool" "passive" energy that blue exuded. At some point this flipped, with blue becoming the color of reason and consideration (and thus associated with "rational" males) and red becoming the color of passion and emotion (and thus associated with "passionate, emotional" females). Why did it switch? Some people blame some marketing campaigns that were carried out at the turn of the 20th century, but the reason isn't totally clear cut. What is clear to me, however, is that when people started associating blue with male-hood and red with female-hood, it wasn't because of some careful consideration and close examination of the previous era's choices regarding color associations. So, today, when associating colors with gender, I don't feel any particular loyalty to "blue = boy; red = girl", because that association wasn't chosen via a considered process and hasn't been in place nearly long enough to have established itself as a truly time honored tradition.