In a lot of places, and when it comes to cars, when people do stuff en masse, it sort of becomes unwritten rule of the road.
For instance when I lived in Hell, ooops . . . I mean South Florida, they installed cameras to fine RToR red light runners. The friendly automotive populace in S. FL became so enraged, that they were seriously considering making RtoR Idaho stops for cars, based on the drivers opinion whether it is safe or not. If you hae ever had the misfortune of spending time in S. FL, you will understand how patently insane this thought is. But to a lesser degree, that happens everywhere. It used to be people ran yellows, then one car would sneak through the red, now as many cars go through the red as they can without actually making contact with the cars who have the green. Im for red light cameras. They would provide a never-ending supply of money for a county. But, tell people right up front this is an "idiot tax". You make the determination if you want to pay it yourself. It's not about safety or anything like that. Just separating selfish drivers from their cash