I think it has been discussed a few times that Wikipedia is a place where various kinds of zealots, fanatics, and obsessives can go and play a variant of the game of Diplomacy. This tends to drive away normal people who have subject matter knowledge, but are not interested in investing their time in long political campaigns over Wikipedia rules and power struggles.

It seems this happens in many places where the opportunity presents itself. StackOverflow seems to suffer from a similar (not identical) issue.