With messy disagreements over values in modern society, many people think that teachers are likely to attract criticism if they express an opinion about anything, and that it is better just to stay out of the way, keep your head down, and teach according to the textbooks.
對於現代社會價值觀混亂而分歧，不少人認為老師做任何評論都容易招來非議，不如不去碰觸，只要悶著頭把課本教好就好了。