See, what if they can never be intrinsically motivated? no body wants to do "work" - by providing extrinsic motivation, you at least achieve the result (of making them learn something). Who knows, why might even become good at what they learnt, and turns that into a career.
If someone can't ever be intrinsically motivated, then they are likely suffering from psychological inertia (apathy) and there are other, more pertinent issues to address. IANAPsychologist
