you know
teachers be complaining about how much work they have to do while giving you more work to do, meaning more work for the teachers to grade. Oh, the hypocrisy. Also the actual disrespect students give to the teachers can also justify the amount of work they give to the kids, because not only are teachers required to give a certain amount of work to the kids, it's up to the teachers on how much more work they can give.
The teachers can be justified because they are disrespected so much by the students, and the kids don't think it's their fault when all the teacher is trying to do is their job. But the students decide to make the teacher's life a living hell.