Labeling this a "we" problem doesn't help much. It tars everyone--including the majority who are getting along just fine--with the same brush, and it spreads the responsibility so thinly that nobody is responsible.

In most communities (including many companies) there are a few people like to rile things up, either out of boredom or out of an inability to handle other frustrations in their life, and there are people who like to react. While they're going at it, normal discourse gets drowned out. Eventually, the fire burns out, and things go back to normal for a while. The best advice in the meantime is to advise people to take deep breath before posting, and to avoid the temptation to feed the trolls.