They have to, shampa sadhya..! Giving the students the homework will ensharpen their responsibility as students. Even though they are off from their schooling activity at school, but they still have allocate their time to improve their way of thinking by doing things given by their teachers at school.
It means, in their daily activity during their holiday, they are demanded to organize their time very well; to study, to play, to take a nap, and so on. An this one will train them to be good organizers.
The problem is, sometime some of their teachers give much more homework than they could bear. In facing this this condition, it is needed so much the wisdom of the students' parents to be by the side of their children; helping them to organize their time in their daily activities......!