I agree with you but my question is does increased police presence lead to a poor neighborhood. Take for example a middle class white neighborhood. If there was a sudden and very visible increased presence over years, arresting people for minor offences, watching everyone and questioning everyone, would that neighborhood become a poor neighborhood. I think it would. I think people who could would move out, property values would drop and the people who could not move out would have a higher predisposition to crime as they were worked into the system.