A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
In other words, prizing discourse without limitations (I tried to find a convenient analogy for said limitations and failed. Fenders? Safety belts?) will result in an environment in which people are more comfortable speaking the more social privilege they hold.
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.
Oh, I see what you mean. I think you're linking this comment to the original post more strongly than I meant. By calling it "tangential" I meant to distance it a bit, since it wasn't an argument for particular tactics towards getting diversity (e.g. "having norms that prevent certain views from being expressed", as you put it). Rather, it was an explication of why diversity might be desirable to have.
I take the opposite of diversity to be something like unanimity. A reason to seek diverse views rather than unanimous ones is that diverse views carry more information. They've got a bunch of wrong ideas too, of course; but their errors are less correlated than those of a unanimous population.
I don't see anyone on lesswrong arguing that lesswrong should have more unanimity. To me that seems like a strawman.