Also known as why I am elated when someone makes an appointment for tutoring, and disappointed when someone is doing poorly and does not request help.
The goal is non-movable: learn these things and demonstrate that knowledge.
The process of achieving the goal is moveable; what is impossible to do alone without training can be done with the help of someone to train a person.
The question asked should not be, 'Why aren't they trying hard enough?'
The question asked should be, 'Why aren't they able to reach the goal?'