Even if you don't care you still have to try.
Good work comes from making a noble effort despite disinterest or handicaps. Of course, passion increases the motivation to do good work. But people rarely do what their passionate about, mostly because they can't identify what their passion is in the first place.
Showing a little bit of care separates the professionals from the sloths. If you're willing to be part of the solution, not the problem, you'll be ready to achieve a lot when your time comes.