The crank has a favourite line, and it is worth taking off him at the start. They laughed at Galileo. They did. They also laughed at ten thousand people who were simply wrong, and the laughter was right about all of them. Disrepute is, most of the time, deserved. The overwhelming majority of ideas outside respectable opinion are outside it for the excellent reason that they are false, or malign, or both. A society that treated every marginal claim as a persecuted truth would fill its head with nonsense inside a week. Respectability is a filter, and like most filters it is right far more often than it is wrong. Forget that and you become insufferable, and usually credulous.
Grant it in full, and a stubborn residue remains. Respectability is a lagging indicator of truth, and the lag is real. Some ideas were punished as disreputable while turning out to be correct - held at arm's length by serious people not because the evidence was against them, but because the timing was. A physician who suggested doctors were killing mothers by not washing their hands was driven from his profession for it. He was right. A geologist who proposed that the continents had drifted was treated as a curiosity for decades. He was right. In each case the respectable position was the wrong one for a generation, and the correction came late, with apologies owed to people no longer alive to hear them.
The gap the word hides
What these cases share is not that the outsider is always right. He is almost always wrong. It is that the respectability of a claim and its truth are tracking different things, on different clocks. Truth answers to evidence. Respectability answers to what serious people can say to one another without cost - which is a social fact, shaped by who holds status and what that status currently protects. The two usually point the same way. That is why the filter works. But they are not the same measurement, and when they come apart, respectability moves last. It lags, sometimes by years, because it takes time for the cost of saying a true thing to fall to zero. The people who paid that cost early are rarely thanked.
The discipline this asks for
The useful conclusion is not the crank's, that disrepute is a badge of honour. It is usually a badge of being wrong. Nor is it the courtier's, that today's consensus is simply the truth. It is the truth with a delay and a social filter laid over it. The discipline the lag asks for is harder than either. Judge an argument on its evidence and its structure, not on its standing in polite company - while holding firmly in mind that most disreputable arguments will fail that test, and should.
Respectability tells you where the consensus sits now. It does not tell you whether the consensus has caught up yet. Those are different questions, and there is no shortcut for the second one. You answer it case by case, on the merits. Because the shortcut - believing the standing instead of the argument - is the exact thing that produces the lag in the first place.
An opinion of the house. The argument is ours; the record beneath it belongs to no one.
How this piece was made
How this piece was made. The strongest guard against the piece being misused - that disrepute is usually deserved and the "they laughed at Galileo" move is the crank's favourite - is conceded up front and repeated, so it cannot be read as "forbidden ideas are therefore true." The examples are deliberately uncontroversial and historical (Semmelweis on handwashing, Wegener on continental drift) rather than current culture-war cases, to keep the argument epistemic. The claim is that respectability lags truth on a social clock, not that any particular present heresy is correct. A critic should press exactly where the piece plants its flag: that judging the argument on merits, case by case, is the only reliable method - which is demanding and offers no shortcut, by design.
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