I suspect the effect you're seeing is relative to a US-based libertarian viewpoint, and comes from many of the contributors not being in that category. So it might well look that way relative to LessWrong community norms. Describing it as a "heavily ideological website" when it's nothing of the sort is not how I would steel-man your argument, and may not serve your advocacy of said argument optimally.
What are the best example articles of what you're talking about, and what's wrong with their positions? (If possible, pick something bronze or better, silver if possible - there's certainly a lot of complete shit there, but anything silver or higher means effort's been put in and saves me just answering with a probably annoying "yeah, that article's shit".)
And by the way, what are "the intellectual institutions whose output inspires the RW writers"? I can tell you if they in fact inspired me, for example.
FWIW I largely agree with Vladimir_M that RW has a strong tendency to assume a broadly left-centrist political position. This happens also to be more or less my political position, so I'm fairly sure this isn't the result of political fanaticism on my part.
I'm not sure I'd describe it as "heavily ideological", for the rather boring reason that to me that suggests not only a definite political position but a fairly extreme political position, and being "broadly left-centrist" isn't that.
But, e.g., take a look at the page on David Cameron...
I am not sure whether this has been posted here before but I came across this: http://rationalwiki.org/wiki/LessWrong
What do you think about RationalWiki in general, and their opinion regarding LW?