One of the most dangerous mistakes that a human being with human psychology can make, is to begin thinking that any argument against their favorite idea must be wrong, because it is against their favorite idea. Alternatively, they could think that any argument that supports their favorite idea must be right. This failure of reasoning has led to massive amounts of suffering and death in world history.
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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. The previous post was Resist the Happy Death Spiral, 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.