There are several important factors. One factor is transience. A second factor is fears. Many residents fear crime, criminals, and governmental authority. They learned the fear-government attitude through bitter experiences in their home countries and perhaps some bitter experiences here.
Time is a third factor.
Going to a police station or court takes valuable time away from one's work and family. Members of the working class are least likely to be able to afford such time. Fourth, criminal activities are attractive. There are many vulnerable young people who can be recruited into crime. The vulnerability is due to poor job opportunities, difficult school challenges, and the appeals of people already in the crime business.