Funny thing - the last time I saw a promising forum destroyed, the beginning of the end was when people got all in a panic about some purported external threat and started demanding a "united front" to combat it. Then they started calling for retribution against anyone who didn't join them. Then they just kept fanning the flames of hostility against anyone on the forum that they decided wasn't sufficiently devoted to their cause, and the forum ended up tearing itself apart from within.