In addition to his brother Allie's death, what factors contribute to Holden's downfall/ depression?

has a deep
desire for connection with other people, but he does not have the skills to make genuine
connections in most cases. He is very sensitive to injustice but, again, doesn't have the skills
to combat it effectively. He is perceptive and intelligent, but his personality is a bad match
with the boarding-school environment, at least when he is in his adolescent state of depression
and grief. He's inadequately connected with his family, especially his parents. Finally, his own
coping strategies make things worse for him. 

I write the paragraph above
with Holden as the subject of the...