At some point in a person's "training" as a rationalist, there comes a time when they are supposed to be ready to undertake controversial conversation topics without spontaneous combustion of their discussions.
I've found that people, in practice, tend to believe this point comes about five minutes after they've been introduced to the concept of rationality.
Empirically, I do think people who've put sufficient effort into debiasing are better at talking about value-loaded topics than those who haven't. But that doesn't do us much good as long as we lack accurate metrics of rationality (introspective or otherwise), effective ways of telling people that they probably haven't leveled up enough to participate productively in a given discussion, or sufficient native forbearance. "You seem to be mindkilled" is about all we've got, and that tends to be interpreted, often correctly, as a partisan attack.
For example, what would be inappropriately off topic to post to LessWrong discussion about?
I couldn't find an answer in the FAQ. (Perhaps it'd be worth adding one.) The closest I could find was this:
However "rationality" can be interpreted broadly enough that rational discussion of anything would count, and my experience reading LW is compatible with this interpretation being applied by posters. Indeed my experience seems to suggest that practically everything is on topic; political discussion of certain sorts is frowned upon, but not due to being off topic. People often post about things far removed from the topics of interest. And some of these topics are very broad: it seems that a lot of material about self-improvement is acceptable, for instance.