On a similar note wedrifid_2008 recommends The No Asshole Rule. (I don't know whether I concur. I can't entirely trust his impressions.)
No Assholes, No Whiners.
I think most people would agree with that, but there would be wide disagreement about who those labels apply to.
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.