On top of this is the current trend of "campus democracy," where everything is decided by majority vote, so that the professors have divided into clearly defined camps; if you offend the students, they will work with other professors to attack you, so why bother?
再加上今日「校園民主」，一切依賴投票表決，校內教授門派分明，如果得罪學生，可能導致學生與教師聯手反擊，何必呢？