I do disagree. LessWrong isn't the mouthpiece of SIAI, that would be the SIAI blog. I don't think it's reasonable to expect top-level posts on LessWrong to represent the SIAI's views, and even less to expect that of discussion posts, comments and voting patterns.
There may be a fair amount of SIAI-oriented posts by Eliezer or others on LessWrong, but I don't see that as using LessWrong as a platform, but rather "the SIAI talking to LessWrong people".
LessWrong may be The SIAI's most popular advertisement platform, but that's because the quality of Eliezer's writings and the community attract more audience than the SIAI website does.
Eliezer needs nerds for the SIAI; instead of going through the effort of hunting nerds in the wild, he created LessWrong in the hope of having a self-sustained place where nerds like to hang out and are already familiar with his ideas. But LessWrong isn't supposed to represent the SIAI, apart from the fact that it was shaped with the features that make it a good hunting ground for the kind of nerds Eliezer needs. A lot of features required for having a functional internet community (moderation, karma, openness) have nothing to do with the SIAI's goals themselves.
I'm rambling a bit, but I still think that LessWrong is the wrong place to come to complain about things you don't like about SIAI. Information flow is mostly SIAI -> LessWrong. And also the issues of "what the SIAI should do to reach it's goals" is very different from "What features should LessWrong have to be a valuable community".
I still think that LessWrong is the wrong place to come to complain about things you don't like about SIAI.
I don't necessarily agree but I will do you all a favor and from now on send any criticism directly to the SIAI, via e-Mail or otherwise. Except someone else starts a discussion about the SIAI here, in which case I might post a comment.
I was recently thinking about the possibility that someone with a lot of influence might at some point try to damage LessWrong and the SIAI and what preemptive measures one could take to counter it.
If you believe that the SIAI does the most important work in the universe and if you believe that LessWrong serves the purpose of educating people to become more rational and subsequently understand the importance of trying to mitigate risks from AI, then you should care about public relations, you should try to communicate your honesty and well-intentioned motives as effectively as possible.
Public relations are very important because a good reputation is necessary to do the following:
An attack scenario
First one has to identify characteristics that could potentially be used to cast a damaging light on this community. Here the most obvious possibility seems to be to portray the SIAI, together with LessWrong, as a cult.
After some superficial examination an outsider might conclude the following about this community:
Most of this might sound wrong to the well-read LessWrong reader. But how would those points be received by mediocre rationalists who don't know what you know, especially if eloquently summarized by a famous and respected person?
Preemptive measures
How one might counter such conclusions:
So what do you think needs improvement and what would you do about it?