I have been thinking quite a bit about cynicism recently, and essentially, the opinion I have formed on it is this:
Cynical contributions are generally designed to shut down creative discussion and problem-solving unless they are accompanied by an informed analysis supporting the cynical conclusion, which is a high-effort, high-skill endeavor and is therefore a high-value contribution. I will call such high-value contributions, which typically come from experts in the given topic, "complex cynicism", which differs from the vastly more commonplace simple cynicism.
Simple cynicism is appealing, especially to the undereducated, because it is low-effort and imparts the illusion of worldly cleverness. However, for precisely these reasons, cynical contributions are almost always low-value.
Most cynicism is, in effect, just noise.