Are you stuck in movie logic?

However, I think "good will hunting" is a bad example.

> “I feel like you have a tremendous amount of intellectual potential that you’re wasting here — why are you getting in fights rather than trying to do something interesting?”

There is a scene where they have this conversation without words. Robin Williams is asking him without spelling it out and Matt Damon understands what the question is and dances around it. They both know what they're talking about even if they don't put it into words. In the case of this specific movie the problem isn't communication, it's just that the main character is incapable of dealing with things inside him that he doesn't understand (aka "emotionally immature"). (well, that was my interpretation anyway).