http://blip.tv/tech-love-live/osb09-donnie-berkholz-assholes-are-killing-your-project-2464449
This is specifically about why it's important to get assholes out of open source projects, but it applies in general. It includes an analysis of the social cost of keeping people around who frequently make other people unhappy, and in particular a way to balance the social costs (distraction, people doing much less work or leaving, useful volunteers not joining, assholes recruiting other assholes, etc.) of assholes against the useful work some of them do.
Whoa, when I read the title of this post I thought it was about killing hostile people. Might want to edit it.
Same here, but that intrigued me and made me want to read it even more. Didn't get what I came for, but still got something of value, so I'm happy.