Why should I care more than you do?

My jobs are different, but they're very much the same. In both of my jobs, it is my responsibility to help my students to do better. At school, I help them with their work. And at dance, well, I help them to be better dancers. But I can only help them as much as they let me. They can have goals, but if they don't let me help them, they won't achieve their goals. If they don't accept my help, accept that I have been there, that I do, in fact, know what I am talking about, they won't make it. They can't do it alone. No one can. And I am learning, maybe the hard way, that I can't put in more effort than they do. They have to care, too. Sometimes, I think I care more than they do. And I really just can't do that anymore. Because then it hurts to much when they turn on me, make me the bad guy-- when they can't see that I am only looking out for them. I want my students, all of them, to do better. But some of them don't want that for themselves. Or, rather, they don't want to put in the work necessary. And then I just can't help them anymore.