Because of the superstition and the stigma of MENTAL ILLNESS and the history of poor treatment for it ....... combined with the fear of being cast out as undesirable (sound familiar, like WT)
People tend to bottle up their emothions and there is no outlet. It's very toxic and literally poisons the person, some can be medically treated and helped, some cannot cope with the constant torture. Because it is just like being tortured from the inside (mentally and emotionally) out. Like an elastic band that is pulled tight - either somethings got to give, release the presssure.... or snap. Broken, can it be fixed, mended,repaired. Sometimes, Not always.
I have learned that when famous / rich / powerful / influencial people get sick and experience these things and the horror of the suffering involved, or they have to watch one of their loved ones going through it. Well, it tends to touch a cord, and said people usually end up a bit more kind caring and sensitive as a result. They learn to change whatever it is that is wrong, that is causing this illness and what is the treatment. Just like cancer and aids and a lot of others.
One of the Golden rules in life that I learned when young is ....... '' Horses are INDIVIDUALS and must be treated as such '' it struck a chord with me and stayed, people are like horses .... INDIVIDUALS and must be treated as such. We are such complex creatures and we are only now discovering and un-locking many many things.