Drinking is only a small part of the college experience. Learning moderation is part of it too. By publishing the percentages of students who made an A, B, C, D, or F in a class taught by a particular professor, the booklet is supposed to serve as an indicator of how well a student who is considering enrolling in the class may do in the future. Students cannot base their academic careers on such a booklet. First of all, the fact that 15 out of 30 students earned an A in a professor's class one quarter does not have anything to do with the grades of future students.
Students earn their grades.
Whether they earn an A or an F is entirely up to them. SGA maintains the booklet only identifies professors who are unreasonably harsh in their grading policies. Third, the reason for attending college is to learn, not necessarily to earn good grades. Many students get caught up in the quest for that perfect 4.0 and forget the need to learn the subject matter. If a student keeps learning as his goal and main objective, though, the good grades will automatically follow, regardless of the disposition of the professor.