Such behavior hurts morale and erodes the support of your team. Since victims often believe no one thinks they are important or takes them seriously, start your interactions by listening to what they say. Steer them toward the facts, which are usually much less negative than their interpretations. When you ask for suggestions to improve the situation, maintain control by bringing up the negatives yourself, then dismiss each logically. Direct their attention to the more positive aspects of the situation.
Victims seem pale compared to true negators.
Negators aren't just negative, they distrust anyone in power. Stay positive, but realistic. Delay discussing solutions, since negators will dismiss every solution as soon as it is spoken. Refuse to argue with them and stick with the facts. Anticipate any objections they may raise and prepare facts and information to refute them.