One reason why this issue can be ignored is that the mentally ill are easily forgotten. They are out of sight, out of mind.
Unlike in Hollywood movies, they are not criminals. They do not rape, pillage, steal, murder. The cops have enough to do with trying to catch criminals.
Churches used to feed, clothe and house the mentally ill but not so much now. Those are few and far between.
The government is reactive, not proactive, when it comes to fulfilling needs.
Private industry and scientific research offers some hope. I'm hopeful when reading about brain research. There is help on its way.