You see, I've seen the word "rationalism" used to mean all five of these things at different times:
- The belief that we should come to know the world through reason and experimentation, shunning intuition.
- The belief that we should come to know the world through reason and intuition, shunning experimentation.
- The belief that we should come to know the world through knowledge of (and correction for) cognitive biases, and knowledge of (and correct use of) probability theory.
- Being effective at believing things that are true and not things that are false.
- Being effective at doing things that are good and not things that are bad.
Edited to reinstate that proposed solution, since this discussion is presumably finished.
If the community norms are ones we don't endorse, then sure, let's overthrow those norms and replace them with norms we do endorse, in a targeted way. Which norms are we talking about, and what ought we replace them with?
Conversely, if we're talking about all norms... that is, if we're suggesting either that we endorse no norms at all, or that we somehow endorse a norm while at the same time avoiding discouraging contributions that violate that norm... I'm not sure that even makes sense. How is the result of that, even if we were successful, different from any other web forum?
I was trying to remain agnostic with regard to any specific norms. I'm not worried about particular values so much as the possibility of differentially discouraging sincere, well-informed dissent in newcomers relative to various forms of insincere or naive dissent: over time I'd expect that effect to isolate group opinion in ways which aren't necessarily good for our collective sanity. This seems related to Eliezer's evaporative cooling idea, except that it's happening on recruitment -- perhaps a semipermeable membrane would be a good analogy.