This is a linkpost for https://sideways-view.com/2016/11/26/if-you-cant-lie-to-others-you-must-lie-to-yourself/
So, on ways of smoothing the incentive gradient for high-quality reasoning:
This is a reason to have a "rationalist community." Humans are satisficers. We won't really care about the opinion of literally all 7 billion people on Earth if we have the approval of our own tribe. If our tribe has some norms about how conversation and thinking work, then we'll be pretty able to follow those norms, so long as we expect that our needs are meetable within the tribe -- that is, that it's a good place to find friends, mates, careers, etc.
It's also a reason to think about how UX affects discourse. I'm by no means an expert in this, but for instance, what does karma reward? what types of expression get attention? How can we offer rewards for behaviors we like?
That only helps if your "rationalist community" in fact pushes you to more accurate reasoning. Merely giving your community that name is far from sufficient however, and in my experience the "rationalist community" is mostly that in name only.