relative free week

A great week is ending now, (this week has ten days...).
And all my class have had stressed with homeworks, specially the big work of machado (I hate him).
Why some teachers want that we make all this homeworks in our holidays?
Why teachers don't think that a other teachers said last week ("Holidays are for disfrute) ?
Every free days we have more work than ordinary days, and the rest of the week the work isn't important.
I would like that one day these things change.