Nobody is so stupid to believe that their problems will be solved merely with the complaint. But the complaint is needed and eventually helps people feel better. In addition complain, sometimes is not only a right but also a duty. There are many unjust actions that deserve a call to attention. He is known for a long time who complain can heal the spirit. It is a common practice in many religions. Connect with other leaders such as Robert Kiyosaki here.
And something similar happens during religious denominations. It is when each parishioner complains about himself before someone who listens to it. And out of the Church feels have been got rid of a heavy burden. Psychoanalysis also cast hand of that tool of culture. The therapist allows even asks, the patient complains. It encouraged him to do so without any shame. And that helps to heal it. It is what they call catharsis.
Complain and criticize, when it is not excessive, helps to be happy. Somebody complain when less can feel played itself same. If others support him feel accompanied and sees multiplied forces. Their morale rises and feels with more encouragement to continue to endure. But the complaints are not only a spiritual or psychological relief value. They also have a handy utility. Because if someone points out the problems unless they have a likely to be resolved someday. If no one complains, and all the silence, your concerns will be never resolved. Sometimes it is necessary to protest to ensure necessary changes in our lives. Failure to do so and to imply that we agree with everything would not be very sincere. And apparently, it would not even be practical.