The nation's towns were originally colonial centers, but Papua New Guineans have increasingly moved to urban areas. Increases in criminality in recent years have been a major source of concern. Violent offenses, property offenses, and drug law offenses are all problems. The police are regarded as the main source of crime prevention. Their efforts are increasingly directed at motivating the community to be active in crime prevention. Imprisonment is the main form of punishment, although dissatisfaction with it has grown. The prison system has failed to achieve the goals of rehabilitation, deterrence, and reform, but abolishing it would not solve the problem of criminality. Reforms are needed in the laws, in sentencing, and in the correctional system. In addition, crime and its control should not be seen as the responsibility only of the government.