How do you know their ages?

How do you know something else wasn't involved besides the curfew, how do you know that he didn't throw something in the grass?

As far as staffing of the police departments, it should match the race percentages in the city, town, or county you live. If your city is 95% white than it should be no surprise there is not a black officer. Also how many black officers have applied for a position with your city?

The whole picture needs to be looked, although I am not a police officer I do work in the public safety field and hear citizens opinions all the time.