?
This line of thinking is really insulting to teachers.
Do you think for a moment the teachers have a right one way or the other to fail those students?
What would happen when the teacher decides to fail 80% of a class? Do you think that's allowed? Not for a second.
And 'informing the parent about attendance'?
You think the parents generally care one bit?
You think the parents don't know their kids are never in class?
What kind of parent 'discovers' their kid has not been in school for 2 years?!?
That it's the teachers responsibility to spend 4 hours on the phone every day as 70% of her class doesn't show up?
It is the expectation that students:
1) Show up.
2) Paid attention.
3) Don't join gangs.
4) Try to finish the work.
If they do those things, they will get an education.
Beyond that, it's really hard for schools - a school can handle a 'small handful' of special cases, but not much more.