I think it would really help both in terms of outcomes as well as the perception of police if they gave this kind of clear description of what's going to happen. As it stands now, the curfews aren't enforced with any kind of regularity, so they just cause confusion.
Who writes that notice? A coalition of the foot soldiers who are doing the actual arrests, or some high-minded politician sitting behind a desk? Because that politician can't actually make promises about the behavior of the police. De Blasio has been denying that well-documented cases of abuse have happened, and saying that if such a thing were to happen, it'd surely be punished. We've yet to see any accountability for NYPD.
Statements are nice. Actions matter.