I think that there is a link between very low wages and the character of the person, but there are nasty, sadistic people from all walks of life.
Perhaps sadistic people are drawn to working with vulnerable people as paedophiles are drawn to working with children.
I am very lucky that I am aware of my illness - and I lead a life that I have adapted to my needs. But I would not like to live with someone like me.
Society as a whole lacks an understanding of mental illness, especially psychotic episodes.
I don't know the answer to the problem, as with many issues with the NHS the cause of the problem is complex.