I agree that Ross probably fell through the cracks. Ross was admitted to the mental health care system at a time when funding to the mental health hospital was in decline. It was felt that many of these patients could do better by being in the mainstream population while being cared for on an out patient basis. The mental health population in California state hospitals was cut almost in half between 1959 and 1969. Unfortunately, there were not enough programs in place on the outside to accommodate the influx of mental patients hitting the streets. There was not enough housing nor general oversight that these patients were receiving the care and medication they needed.
This is an older article, but it's a good one, regarding the mental health care situation in the US.
http://www.nytimes.com/1984/10/30/scien ... began.html