That girl almost feels psychopathic. But if what the teacher is pointing out is true, then her act of not caring is to hide her own insecurities. In other words, she's a really weak person. Even though she may or may not be a product of her environment, if she persists in not caring and feigning innocence I'd say extreme measures have to be taken because people like that will only become a menace to society as a whole if they ever end up in a position of power.