It sometimes seems to me that the issue of how much trust to accord outside views constitutes the primary factional division within this community, separating it into two groups that one might call the "Hansonians" and the "Yudkowskians" (with the former trusting outside views -- or distrusting inside views -- more than the latter).

I share Michael Vassar's impression about the statistical distribution of these viewpoints (I'm particularly expecting this to be the case among high-status community members) , but an actual survey might be worth conducting.