If at first discipline doesn’t succeed, … Try, Try Again!
Discipline fails oftentimes because the disciplinarians quit too early. Junior is grounded because of bad grades, then he goes and sulks in his room, determined to do even worse the next test just to spite Mom and Dad. Junior makes out on both fronts; he does do worse, and Mom and Dad get so frustrated that they quit grounding him because it “doesn’t work.”
It’s not supposed to work. Not like that, anyway.