Where I come from, Canada, the red light cameras only snap if you ENTER on red. They prove it by taking more than one picture. The first showing you outside the intersection and the light is red. The second, after you have entered the intersection. The pictures also show a large chunk of the intersection. If there is an extraordinary occurrence, it's in the picture and you can show it to the judge.
Frankly, I think it's a great idea to have cities generate money from automated tickets. Cities need funding and what better place to get it than from aggressive drivers? I've driven around photo radar and redlight cameras all my life and, you know what: TICKET FREE! If you can't obey the rules, you shouldn't be driving!
Of course, if municipalities want to ban the devices then more power to them. I wouldn't agree with it where I live, but that's what the political process if for.