Certainly if you do it in public, you don't have doubt yourself. Everyone else will do it for you.
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Historians pour over this sort of stuff. If a historically interesting figure wrote a letter to their neighbour to complain about a noisy dog, it's been carefully preserved and obsessively analyzed. Historians want to get inside their subjects' heads and figure out what they were thinking when they did that big, important thing, and every scrap of remaining written material helps.
We live in a period that is going to be real tough on historians studying it. Over the last few decades, physical correspondence (i.e. letters, etc.) has mostly died out. A lot of people still journal, but on their computer. Will that folder of old journal entries be found by whoever inherits your house full of junk or will it be tossed? A dead-tree diary is pretty easy to recognize for what it is. A computer's contents are comparatively easy to overlook.
Most people who have lived over the last few decades have had multiple email addresses that, at first, they eagerly used for personal interactions and then, over time, more and more only for professional/commercial correspondence. At the same time, people started writing for fun and passion under anonymous pseudonyms in a variety of online forums. Some remain online and still operating. Some have been curated and remain online. Some are archived. Some are just gone. Then came social media and texting. A huge proportion of people's most intimate interactions are in texts now, but for how much longer? We seem to be on a novelty treadmill when it comes to personal interaction mediums. Yesterday's source of joy is today's chore.
Imagine that you do something really significant in a decade or so, and some historian a hundred years from now is trying to figure out why you did it. Getting access to as much of your written output as remains and correctly associating the anonymous stuff with you is going to be a tough problem. How much of what is online today will remains? How much of it will be possible to associate with you, and not a pseudonym? Even if they speak your native tongue, they'll have to learn how to interpret your slang and texting shorthand. This sounds almost impossible today, but what kind of tools might they have in a century?
My suspicion is that history is going to remain remarkably unchanged in a very specific way: For some historical figures we'll have mountains of material. Others, despite their importance, will be complete enigmas.
That doesn't sound impossible. Perhaps LLMs can already do this.
Why give them more stuff to steal for free?
(HN techbros are slow on feeling the pain of the greed and corruption, partly because we can temporarily ride the coattails of the exploiters. And partly because we don't have field-wide strong tradition of ethics and integrity, unlike some disciplines that are objecting fiercely to plagiarism and shoddy quality. But eventually HN will feel the livelihood impact, and many AI slop poems will be written about not speaking up when some earlier groups got wronged.)
There is no advantage to being "more public" when it's all to common to get hit by marauding bands of idealists and trolls of all atripes. Nobody rewards you for having nuanced opinions on things like immigration publicly, nor trans rights, nor even something as banal as programming language choice.
We've now lived through a full pendulum cycle where public writing that was insufficiently woke was punished via internet lynch mobs and state pressure, and now we are seeing the exact same thing with insufficiently reactionary ideas invoking...internet lynch mobs and state pressure.
So, no, I don't think I will be more public, and I'll be unsurprised--if sad--when other rational actors do similarly.
There's no reason to be public, because people have made it clear that they'd rather support a system that attacks that than protects it.