https://marco.org/2008/02/17/theres-a-sort-of-greshams-law-of-trolls-trolls
There’s a sort of Gresham’s Law of trolls: trolls are willing to use a forum with a lot of thoughtful people in it, but thoughtful people aren’t willing to use a forum with a lot of trolls in it. Which means that once trolling takes hold, it tends to become the dominant culture. That had already happened to Slashdot and Digg by the time I paid attention to comment threads there, but I watched it happen to Reddit.
— Paul Graham: Trolls (via azspot)