How is Cho reported to have been in possession of presumably, prescribed antidepressants, according to the NY Times story? This story just leaves more questions, IMHO.
BTW, cognitive behavioral therapy, the most common therapy in current use, implies a rational patient. IIRC, The judge described Cho as a danger to himself. I don't know why the judge thought outpatient treatment would be sufficient.
It often comes down to money. Inpatient treatment is expensive so money is often a primary concern when prescribing treatment for the mentally ill.
I saw this firsthand as a police officer. You could get a doctor to commit them at the E.R. but if the mental health worker committed them it was often just for a few days until they could set up “voluntary” appointments for outpatient treatment.
The safety of the public comes after budget constraints in my experience.