In Jackson Michigan last summer a man killed and elderly woman and cut her head off. Police found him in her clothes. He said that the neighbor was spying on him and emanating rays at him.
It turned out that his family had been trying to have him hospitalized for years but nobody could hold him for more than a few days. Eventually the family drove him away with a final warning to the courts that someone is going to die. A year later an elderly neighbor did die.
One of the solutions to these “senseless” violence episodes is increasing the number of inpatient psychiatric beds to the 150K it was in the 1950s.