Throughout the Uncharted series, character of all walks of life have strode into the spotlight with smiles, maniacal or otherwise, on their faces and made impressions on how the other people in the game got to live their lives. The main protagonist, Nathan Drake, attracted many people to his side in order to save the world time and again. Overall, the witty thief most likely displays a more impression management-like approach as this seems to be the most recognizable approach to developing his morality in the new situations he comes across. This, of course means that as other people with different ideas of what is right and wrong come around Nathan alters his own ideas of right and wrong to avoid offending the people he is around and create a more cohesive environment while he is around them. And this would appear to be the most clear option of how Nathan Drake underwent his moral motion.