I do like the cameras but only because I've been nearly T-boned many times, despite being an observant, defensive driver. Traffic enforcement is very lax in SoCal, and the running of red lights, especially while talking on the phone, was becoming a constant threat. The cameras seemed to have helped lessen the frequency of such violations, even though they aren't all that common in most areas.
However, many people are confused about yellow lights, red lights, and intersections. The law is pretty simple and I believe the same in all jurisdictions: you can legally enter the intersection at any time before the light turns red, up to the last instant of the yellow light. The yellow light is merely a warning that the light is about to change to red. (See, for example, California Vehicle Code Sections 21452 and 21453.)
Entering the intersection means crossing the limit line, which is defined by the thick white line at each corner, or if there is no limit line, before entering the crosswalk, or if there is no crosswalk, before passing the signal or stop sign. If you get past that point before the light changes red, there's no violation. You are not required to clear the intersection before the light turns red -- although you might get tagged for impeding traffic if you get stuck in the intersection (California Vehicle Code Section 22526).
The confusion about this is widespread. Once I even got into an argument with the instructor at traffic school (in California, if you get a ticket you can often go to traffic school to avoid having a point added to your record -- you still have to pay the fine and pay for the school, which is otherwise a total waste of 8 hours). Anyway, this dopey broad insisted that you have to clear the intersection before the light turns red. I raised my hand and, in my usual charming way, said, "That's wrong!" We got into a heated argument until she literally threw me the book (the California Vehicle Code, which is about the size of a typical bible) and said, "Look it up, smart ass," so I did. When I read the applicable code sections to her, which are crystal clear, she backed down a bit but suggested that I might be misinterpreting the law. Not!