It is debated whether cameras detour crime by violent idiots as such. However, to the extent they help solve crime, they remove these offenders from the violent population, and further segregate the underclass from those who live lawful lives.

http://www.techcrunch.com/2008/08/02/preventing-crime-with-tech-the-newark-experiment/

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To show his dedication, Booker lived in some of Newark’s most dangerous neighborhoods, well before becoming mayor. He continues to live in a blighted neighborhood today.

In 2007 three young adults were killed execution style in a Newark schoolyard (a fourth person survived being shot and knifed in the face). Security cameras at the school weren’t working.

Booker used the incident to launch Community Eye, a project that uses high quality security cameras and a gunshot detection system to monitor an eight square mile crime-heavy area of Newark. The cameras have night vision, record in high definition video and stream wirelessly to a nearby police station, where officers can control the cameras, zoom in on areas, etc. The gunshot detection system can triangulate on gunfire immediately after firing, and can automatically move cameras to monitor the area. Police are able to respond immediately.Community Eye now has over 100 cameras in place, and the gunshot detection system is going online soon.
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– Michael