Invisible is such an interesting choice of words. One of the problems with urban America is that our mentally ill are hyper-visible -- you see them every time you sit at the access road waiting to get on the highway, and every time you leave the bank or grocery store, and a million other places.
Modern mental hospitals, while surely not all stereotypically horrifying, seem to find it hard to gain a middle ground between visible and invisible.
I haven't read the article but I hope I get time to.