Sharp: Closing a door

Google "Assholes are killing your project". There are dozens of versions of this talk, but the one that I saw had a couple of graphs. The one that stayed with me was a graph of rate of contributions to glibc over time. It had to big "jumps". The first was when they switched to git; the second was when Ulrich Drepper stepped down as project lead. Drepper was technically very good; but there is no way that he as a single individual could make up for the development output of all the people that he drove away.

Also read "The No-Asshole Rule", by Robert I. Sutton -- that's more general, but has lots of evidence as well.