I guess my thought was that LWers are likely to think that its possible to implement values incoherently (ie correctably), and so might have much more to say (and learn) other than your average "clever person". Scope neglect, cognitive dissonance, etc, etc.
My guess would be that really solid rationalists might turn out to disagree with each other over really deep values, like one being primarily selfish and sadistic while another has lots of empathy and each can see that each has built a personal narrative around such tendencies, but I wouldn't expect them to disagree, for example, over whether someone was really experiencing pain or not. I wouldn't expect them to get bogged down in a hairsplitting semantic claim about whether a particular physical entity "counts as a person" for the sake of a given moral code.
And "we just have different priors" usually actually means "that would take too long to explain" from what I can tell. Pretty much all of us started out as babies, and most of us have more or less the same sensory apparatus and went through Piaget's stages and so on and so forth. Taking that common starting point and "all of life" as the evidence, it seems likely that differences in opinion could take days or weeks or months of discussion to resolve, rather than 10 minutes of rhetorical hand waving. I saw an evangelical creationist argued into direct admission that creationism is formally irrational once, but it took the rationalist about 15 hours over the course of several days to do (and that topic is basically a slam dunk). I wouldn't expect issues that are legitimately fuzzy and emotionally fraught to be dramatically easier than that was.
...spelling this out, it seems likely to me that being someone's aumann chavutra could involve substantially more intellectual intimacy than most people are up for. Perhaps it would be good to have some kind of formal non-disclosure contract or something like that first, as with a therapist, confessor, or lawyer?
Taking that common starting point and "all of life" as the evidence, it seems likely that differences in opinion could take days or weeks or months of discussion to resolve, rather than 10 minutes of rhetorical hand waving.
All of our lives, or even a month of it, probably imparted to us far more evidence than we could explain to each other in a month of discussion. The trouble is that much of the learning got lodged in memory regions that are practically inaccessible to the verbal parts of our brains. I can't define Xs and you can't define Y...
Summary: I propose we somewhat relax our stance on political speech on Less Wrong.
Related: The mind-killer, Mind-killer
A recent series of posts by a well-meaning troll (example) has caused me to re-examine our "no-politics" norm. I believe there has been some unintentional creep from the original intent of Politics is the Mind-Killer. In that article, Eliezer is arguing that discussions here (actually on Overcoming Bias) should not use examples from politics in discussions that are not about politics, since they distract from the lesson. Note the final paragraph:
So, the original intent was not to ban political speech altogether, but to encourage us to come up with less-charged examples where possible. If the subject you're really talking about is politics, and it relates directly to rationality, then you should be able to post about it without getting downvotes strictly because "politics is the mind-killer".
It could be that this drift is less of a community norm than I perceive, and there are just a few folks (myself included) that have taken the original message too far. If so, consider this a message just to those folks such as myself.
Of course, politics would still be off-topic in the comment threads of most posts. There should probably be a special open thread (or another forum) to which drive-by political activists can be directed, instead of simply saying "We don't talk about politics here".
David_Gerard makes a similar point here (though FWIW, I came up with this title independently).