Government safety nets – including extension of unemployment benefits and a growth in food stamp recipients – may also have helped to keep despair down and crime rates low, criminologists suggest. At the same time, new policing tactics, including the "broken windows" theory, and booming prison populations – currently at 1.6 million, five times the number of people incarcerated in 1977 – have succeeded largely by targeting specific lawbreakers and high-crime locales instead of broader social injustices, some social critics say.