If you want to increase participation on Less Wrong, converting irrational thinkers to rational thinkers is the only way.

Less wrong does not have a mandate to educate the merely interested, probably because most of that kind of interest seems temporary. The educational efforts that seem required are rarely intrinsically rewarding. And the bar for valued participation is so high, it discourages the unprepared.

Less Wrong seems to be trying to create plenty of tools for self-education on the subject of rationality, so I don't know that a mandate to educate individuals is necessary... But I do think that anyone who is compelled to reply someone at a different level of education on a subject than themselves ought to feel compelled to point out where the energy for contribution/education should actually go, instead of merely curbing the enthusiasm to participate.