I'm not saying that I'm saying a small number of mentally unwell people cause most of the visible problems that affect quality of life. There were 60000 homeless in NYC of that about 2k were street homeless and not housed in the shelter system. Even if we assume all 2k of the street homeless are dangerous insane and violent getting even 350 of the worst offenders off the street would drastically improve the quality of life for most new yorkers.