Answer: Obstructs people to learn from their past mistakes
Step-by-step explanation:
According to the question, the major problem that occurs in the situation where past behavior is proven or explained in order to protect their self-respect is that it does not let people acknowledge their mistakes that they made in their past.
People justify the source and reason for past happening rather than learning from it so that same mistake is not repeated in future.
Other option are incorrect because people do not ignore negative facts about own self,transform into narcissistic and improvement is not generated as compared to earlier times.