Survival of the fittest.

Over the ages, a select few of mankind have adopted the strategy of endlessly complaining as a means of self-defense. "A select few" being early Neanderthals (in the form of screaming and yelling), two-year olds (Again, screaming and yelling), and the first born in most families (*cough*). According to various accounts, logic and reasoning serve as good counters towards such people, but are to be used cautiously, as it makes them irate and hostile.