I am a forensic psychiatrist. What happens too often here in the US is that the person who needs treatment ends up doing something that gets them arrested. Then

I am a forensic psychiatrist. What happens too often here in the US is that the person who needs treatment ends up doing something that gets them arrested. Then they may (or may not) get treatment through the justice/correctional system. In the wake of the closing of thousands of psychiatric beds, we call this "trans-institutionalization." It has also become more difficult to hospitalize and treat people against their will. Both of these changes were well-meaning, and sought to curb abuse (some real, some imagined). Some old psychiatric hospitals were bad places, but after they were closed there has not been an effective replacement. That makes jail/prison the default result for far too many people.