It's a false choice. We don't need to blame anyone for the boy's illness, and we certainly don't have to see this child as a helpless victim.
Child with genetic predisposition for anxiety and eating disorders diets. Child's body goes into a self-perpetuating cycle of malnutrition. Mental symptoms ensue. That's the only part of this article that relates to eating disorders in my mind.
Bullying IS bad. But you should not have to have an eating disorder or become suicidally depressed for bullying to be harmful and unacceptable and OUR JOB to address - individually and as a society - period.