About 30 years ago I gave evidence at an inquest into the death of Lester Donaldson, a mentally-ill man who was shot by police. The jury came out with the same recommendations that have been repeated by every jury since then, yet the deaths are still happening. What we are doing is simply not working. 
The one common factor with all of these deaths is that the person involved has either refused treatment or has stopped medication. As any relative of a person suffering from schizophrenia can tell you, people with a serious mental illness often have no insight into their illness and do not believe that they are ill. Yet they are allowed to make medical decisions on the false assumption that they are competent. 
A way must be found to treat people before they become so agitated and confused that they become violent. Unfortunately our society is so hung up on individual rights above all else that the mentally-ill are allowed to destroy themselves rather than submit to treatment.