Lunatics and crackpots don't necessarily have seriously flawed thinking. Different priors, different information, and small biases can lead to entirely different conclusions.
In my experience, what leads to becoming a crackpot is when one's ego significantly exceeds one's intelligence. Now, If only I had a way to measure both on the same scale...
Today's post, Tolerate Tolerance was originally published on 21 March 2009. 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. The previous post was Why Our Kind Can't Cooperate, 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.