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 wasn't thinking adderall, although that's a plausible example.
I'm thinking of things like "it's not safe to leave ten-year-olds alone in the house, or have them walk a few miles or run errands on their own." It's demonstrably more safe now than it was in the past, and in the past ten-year-olds dying from being unsupervised was not a major cause of death.
(More safe because crime is lower, more safe because medicine is better, more safe because more people carry cameras and GPS at all times, etc.)
Up until three or four generations ago, people routinely got naked to swim in creeks and ponds and quarries, casually and easily, and it was fine and not a major vector for sex crimes or moral corruption.
Up until three or four generations ago, people (in America) weren't insanely terrified of cosleeping and didn't erroneously believe that it was putting your infant at irresponsible risk (it isn't; the data are clear and cosleeping is done in the majority of the world, including many nations with lower infant mortality than the US).
Up until three or four generations ago, kids would rub shoulders with way more adults, in way more contexts, rather than today, where lots of people think that kids should never be around adults who aren't currently doing a professional kid-oriented job (and should restrict their interactions to the domain of that job).
It wasn't even three or four generations ago that our system of taxation (in the US) was wildly different, and now many people act as if wanting to increase taxes on the wealthy is an affront to the Founding Fathers.
These are just off the top of my head, and they're skewed in the direction of some of my areas of interest; apologies for that. The main point is, it doesn't take very long at all for people to forget—if your parents raised you insisting that X was commonplace, and the people around you largely got the same programming, it's hard to know (unless you check) whether X was actually brand-new at the time, or maybe just a generation old.
EDIT: The "nuclear family" is baaasically an invention of the twentieth century; the term wasn't even coined until the 1920's iirc and it didn't become the assumed default until post WWII.
EDIT II: Suburbs! Levittown.
EDIT III: the number of foods that people think we've had forever (bananas, broccoli) but are actually quite recent additions to the human diet.