It's about revenue, not safety
This article really does "say it all" about red light cameras. Money quote:
A comprehensive report conducted by the Federal Highway Administration found that the presence of red light cameras at traffic intersections increased the likelihood of rear-end crashes by 14.9 percent and the number of injuries in traffic intersections by 24 percent. Red light cameras also do little to prevent “T-bone” accidents, where the side of one vehicle is impacted by the front or rear of another vehicle, as those accidents often occur when the driver is not paying attention, and not simply disregarding a red light.Simply put, these people do not care a whit about your safety. It is all about the bucks in their coffers.