Final answer:
One reason for the rapid growth of private policing is the growth of crime in urban areas.
Step-by-step explanation:
The rapid growth of private policing can be attributed to several factors, and one of them is the growth of crime in urban areas. Crime rates tend to be higher in urban areas due to factors such as income inequality, lack of opportunity, racism, poverty, poor schools, gang activity, and drug and alcohol abuse. These factors contribute to a lack of effective social control, making it easier for crimes to be committed.