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Often there isn't actually a fire, they're complaining about trivialities. Everybody already knows about the fire because they've complaining about at every meeting for three months. Or the thing they are complaining about can't be changed. They're actually getting sidelined because they interrupt company allhands to ask the CEO irrelevant questions, wasting the time of 50 people and no one likes them anymore.
I view dealing with chronic complainers as mentoring them to stop self-sabotaging themselves.