Less Wrong seems to be focused on the predictive nature of probability theory and to take ideas serious. I don't think that this is a good approach for any but the most intelligent and educated individuals and organisations. The traditional approach to rely on empirical data and the judgement of experts is to be favored for most people in my opinion.

It is interesting to note that the latter is actually a form of the former, and a particularly strong one at that! In fact, the reasoning that you are using here is using the predictive nature of probability theory.

(That said, I agree that for most people biting the bullet when it comes to their abstract cognitions would be disastrous. Explotions, martyrs and deaths by stoning would abound. That and people would actually act on terrible dating advice rather than their instincts.)