He has overcome some of his worst fears on a number of occasions and risked
his life to save the lives of others. You have to keep his other annoyances
in perspective.
Sure, he's a whining, self-absorbed, inconsiderate individual, but yeah,
mental illness can do that to a person. Fear is one of the most difficult
emotions of all to face, let alone overcome.
I've suffered from one phobia and it's drastically affected my life and my
personality. I can't even imagine what suffering from as many as the Monk
characters suffers from would do to a person.