They should be put in a mental health facility and prescribed anti psychotic medication .I worked in a New York State mental health facility for 28 years .When patients are on the medication they are fine .The problem with violent Schizophrenics is that when they are released many of them fail to take their medication.I knew one guy that was released returned home, but did not take the prescribed medication and gouged his mother’s eyes out .

Legal adjudication required here. Mens rea or actus reus. Unintentional action or premeditation.

I’d say treatment at a societal level (single-payer healthcare) should be available, though it’s likely not. If he commits a crime, it’s severity should be taken into consideration, with treatment & monitoring increased, and incarceration considered.

Depending on the state you live in, if he is incapable or knowing the difference between right and wrong, OR is unable to conform his actions to the law...then he will not be punished. However, if he is a danger to himself or others he may have to be committed