Many people, martial artists and not, are interested in defending themselves and others from physical threat. That doesn't mean that Wikipedia's definition of martial arts is too general or false.
(Although, actually, it's too specific, in this case, since a lot of martial artists are not interested in the defense aspects, but more in physical fitness or enlightenment or whatever).
By "many people" I might have meant "every creature that can be said to have goals at all."
Today's post, The Martial Art of Rationality was originally published on November 22, 2006. A summary (taken from the LW wiki):
Discuss the post here (rather than in the comments to the original post).
This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. It is the first post in the series; the introductory post was here, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.