What did Krakauer's father never understand about his climbing adventure?

Krakauer was much like Chris McCandless. It is only through sober reflection that Krakauer sees how much stress that he caused his loved ones. "Krakauer’s relationship with his father, a fiercely competitive man who expects Jon to become a doctor, is very strained. Krakauer believes that only perfection will please his father". Like McCandless,Krakauer refused to conform. While Chris rejected his father's lifestyle, Krakauer rejected the expectations of his father. This, combined with family secrets, causes much friction.