When an LW contributor is in need of an example of something that (1) is plainly, uncontroversially (here on LW, at least) very wrong but (2) an otherwise reasonable person might get lured into believing by dint of inadequate epistemic hygiene, there seems to be only one example that everyone reaches for: belief in God. (Of course there are different sorts of god-belief, but I don't think that makes it count as more than one example.) Eliezer is particularly fond of this trope, but he's not alone.
How odd that there should be exactly one example. How convenient that there is one at all! How strange that there isn't more than one!
In the population at large (even the smarter parts of it) god-belief is sufficiently widespread that using it as a canonical example of irrationality would run the risk of annoying enough of your audience to be counterproductive. Not here, apparently. Perhaps we-here-on-LW are just better reasoners than everyone else ... but then, again, isn't it strange that there aren't a bunch of other popular beliefs that we've all seen through? In the realm of politics or economics, for instance, surely there ought to be some.
Also: it doesn't seem to me that I'm that a much better thinker than I was a few years ago when (alas) I was a theist; nor does it seem to me that everyone on LW is substantially better at thinking than I am; which makes it hard for me to believe that there's a certain level of rationality that almost everyone here has attained, and that makes theism vanishingly rare.
I offer the following uncomfortable conjecture: We all want to find (and advertise) things that our superior rationality has freed us from, or kept us free from. (Because the idea that Rationality Just Isn't That Great is disagreeable when one has invested time and/or effort and/or identity in rationality, and because we want to look impressive.) We observe our own atheism, and that everyone else here seems to be an atheist too, and not unnaturally we conclude that we've found such a thing. But in fact (I conjecture) LW is so full of atheists not only because atheism is more rational than theism (note for the avoidance of doubt: yes, I agree that atheism is more rational than theism, at least for people in our epistemic situation) but also because
- the readership of LW (and, earlier, of OB) is drawn disproportionately from communities that have long been atheistic (and not just because their members are supremely rational);
- theism has been used so often (here, and earlier on OB) as a canonical example of Wrongness that any theists who might have participated have either deconverted or gone away;
- any theists who remain are keeping quiet about it because they don't want to get jumped on.
Does any of this matter? I think it might, because
- it would be a shame to fool ourselves into thinking that rationality (or x-rationality) is more powerful than it really is;
- we may be scaring away people who (despite their obstinate clinging to irrational superstitions, etc., etc., etc) would be valuable here. As Eliezer has pointed out a few times, Robert Aumann is an Orthodox Jew; whatever mental contortions he may have to go through to maintain that, it seems fairly clear that if he turned up at LW wanting to contribute we would be ill-advised to drive him away. I bet he isn't the only person who manages to remain religious despite knowing a thing or two about rationality;
- we may be annoying and upsetting some readers, which is a (minor) pity in itself;
- perhaps there are other equally good (or better) Awful Examples that we aren't availing ourselves of because the habit of using god-belief for that purpose has become so ingrained.
So. Is theism really a uniquely awful example? If so, then surely there must be insights aplenty to be had from seeing what makes it so unique. If not, though ... Anyone got any other examples of things just about everyone here has seen the folly of, even though they're widespread among otherwise-smart people? And, if not, what shall we do about it?
I have often thought new laws at the federal level should be treated much like new drugs are treated by the FDA. They should go through rigorous testing according to clear criteria. The proposer of a new law should specify in advance what effect they hope this law would have on the world and how we might measure this effect. Then when the law gets passed, a few small states (or perhaps counties) are initially chosen as the test group - the law only takes effect in those areas. To control for the placebo effect, we should also have a few regions in which the law is announced to take effect but is not, in practice, enforced. Then after ten years we look at the data and see whether the states with the new law are better off than they were before and better off than the states without it - better off specifically according to the previously-specified metric to a statistically significant degree.
Only after it passes that test, is the law extended to the entire nation.
Remember: "if it saves one life, it's worth it."
Not all things can be measured practically, and testing of politically-loaded topics (including most laws that have serious opposition) would be inherently biased. Also, as mentioned upthread, many laws would have no effect or drastically different effect when true at only the local level from the effect if national; for example, dry counties (counties with local prohibition) do not resemble the national-scale effects of Prohibition.