We must safeguard our society from dangerous mentally ill people.
The guidelines for classifying must be simplified and available to family and neighbors  by the  medical and legal system.  Allowing these patients to roam the streets and kill innocent students, theater goers, etc is unexceptable in a civilized society.
Yes, the government will have to pay for this but they are already paying for these disasters - after they occur.
Why is this important?
  Mental Illness 
How to provide medical institutions that are humane and locked housing for people who have been diagnosed as a threat to society.