The cameras are a SCAM! They do not improve safety. 
If there are legitimate safety problems, the locations need to be evaluated with a comprehensive traffic engineering study. You have to understand WHY people are running red lights before you can even begin to address the problem. Cameras can't fix sub-optimal light timing or signal visibility or intersection design problems. If you have an intersection in the city that is safe and one with lots of crashes, the difference isn't the drivers, it's the intersection! Mailing tickets to car owners weeks later won't make any difference.