One reason crime is increasing in many areas in the United States is the economic recession. This results in budget cuts for cities, especially local police forces. As they cut cops, there are fewer on the streets and they can only focus on the most violent crime. In the city where my parents live, they barely even investigate homicides anymore because there are so many.
Another problem with a bad economy is more desperate people. People are more brazen about stealing, and more people are turning to a life of crime out of desperation.