What does a curfew suggest? Think about it. Baltimore may have a problem with teen gangs, the accompanying violence, vandalism, etc. A curfew either takes teens off the street, or lands them in jail. It also makes the city safer for others who aren't involved in gang and/or criminal activity.
The question has no option for "Baltimore may have special circumstances but most cities should not impose a curfew".
The assumption that a policy that is right for one place is right for all or wrong for one place is wrong for all is not a good assumption.