Today's post, Ethical Inhibitions was originally published on 19 October 2008. A summary (taken from the LW wiki):

Humans may have a sense of ethical inhibition because various ancestors, who didn't follow ethical norms when they thought they could get away with it, nevertheless got caught.

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 Protected From Myself, 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.