Here's a scenario for you...

Someone comes into class without their homework. If they have a good excuse, like it was their dads birthday or they were locked up all night, they will get in trouble.

Some teachers would rather not give homework, but they have to. It is the parents that want it, apparently.

When someone comes in without their homework, the reason the teachers have to get mad, is because the parents would get furios if they didn't.

Now obviously most teachers like homework, but if they saw what it really does to people I think they may stop...