The human brain is the most complicated thing in the known universe and keeps its secrets well hidden. Genetics and neuroimaging have shown how remarkably complex and interacting are the biopsychosocial causes of mental illness and that there will likely never be magic bullets. Drug companies have stopped looking for them.
This paragraph summarizes the issue of mistreatment of the mentally ill in the US perfectly:
Why is it that the rest of the developed world gets this and what makes us the laggard outlier? How can it be that the richest country in the world is most neglectful of its most vulnerable citizens? The simplest answer to this complicated question is the misplaced US faith that market forces are always the most efficient vehicle for solving problems. Adam Smith—the father of modern economics—knew better and strongly supported the role of government in providing vital public services undervalued by the market. Privatization of mental health has resulted in too much treatment for the well; cruel neglect for severely sick.
The path to improvement is a political one, lobbying the ones in power on behalf of our powerless mentally ill. We need to end their silent suffering.