But this is a different critique, isn't it? Not being able to significantly influence the world for whatever reasons is one thing, being a strawman rationalist with a silly conception of "logic" is another thing. You may be right that LW isn't a highly influential community, but that's not what the linked xkcd is about.
I think a lot of people are misunderstanding the linked xkcd, or maybe I am. The way I see it, It's not about misusing the word "logic." It's about people coming in from the outside, thinking that just because they are smart, they know how to solve problems in a field that they are completely inexperienced in, and have spent very little time thinking about compared to those who think about it as a full time job.
I think we could apply the lessons, anyway, but Munroe might have our community in mind specifically. The alt-text refers to emotional biases. I'm just curious if others got the same impression.
http://xkcd.com/1112/