What is the goal of group therapy according to Nurse Ratched and the doctor?

From the text:

He tells how the goal of the Therapeutic Community is a democratic ward, run completely by the patients and their votes, working toward making worth-while citizens to turn back Outside onto the street. Any little gripe, any grievance, anything you want changed, he says, should be brought up before the group and discussed instead of letting it fester inside of you. Also you should feel at ease in your surroundings to the extent you can freely discuss emotional problems in front of patients and staff.