It seems to be a matter of convenience. It shouldn't be, but that what it looks like. It disrupts the flow of the teacher's classroom. It's viewed as yet anothe

It seems to be a matter of convenience. It shouldn't be, but that what it looks like. It disrupts the flow of the teacher's classroom. It's viewed as yet another disruption, but the worst kind of disruption: the legitimate kind that gives the rest of the class an opening to continue disrupting the class. And that could affect perceptions about how this teacher handles a class. No, can't have that so just sit down and shut up. A good teacher can handle the book being wrong. A good teacher will tell the students that the book has a mistakes on this problem well before they have the chance to discover it themselves. A good teacher will have gone over the material in advance and know what's correct. Instead, we have teachers thrust into roles that aren't near their specialty; teachers that can get a degree and qualify for a paycheck because they can work the system, not because they know how to teach students. And interfering with that teacher's conveniences is not a good thing for a student to attempt.