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It's a great example of the barking dog effect. Put up a barrier between people that they know can't be crossed, and they'll just let loose the wildest aggression possible. The second that barrier is gone, they're back to "normal". It's frightening seeing people's impulses revealed while the barrier is up.

Doesn't a lot of open source collaboration take place over email?

Maybe run a sentiment analysis so the nice emails get to you...