Off the top of my head, I can't imagine they would be terribly surprised with a ticket or fender bender then, much less change their driving habits all that much as a result (aside from an accident which was quite severe), especially if you didn't take pains to explicitly identify your motive. I'm often still surprised at how intelligent and resilient the public seems to be. Given the terms you identify, I wonder why you wouldn't have some kind of plan like doing a u-turn and following the last person who scooted (unfairly and unlawfully) through the light to their destination. Quite a few folks probably already consider road rage or the above concerns (among however many others) as legitimate threats to some meaningful extent and still drive as they do, or at the very least have watched the parking lot scene in "Fried Green Tomatoes". What I think would be more likely to have a lasting influence on the driving habits of (for example) a soccer mom, would be to have a complete stranger follow her through town after she knowingly ran the light (whether they intentionally allow her to see them or not while doing so) and then be approached with concerns of their victimization. They would probably need to approach in a way so as to not excite her into some undesirable reaction. She (given how the general public tends to react at least) would probably think there is something a bit off in their thought process just by virtue of the fact that they would do such a thing, which they could of course ensure with however they present themselves while they are explaining their position. Making an obvious mental note of her license plate and the location would probably help drive the point home, as would things like vague hints of physical attraction or interest in her children and whatnot. As long as they played their cards right (they would have to feel this out as they went), they should have plenty of opportunity to explain their philosophy as the impact of the situation settles in with her. This, I think, would not be entirely unlike what a law enforcement officer would perhaps do with her in a similar situation. A law enforcement officer might even be considered spared the duty of completing the task him/herself to attend to other matters. At the very least, most people would probably consider the experience unpleasant to some degree; if she's defensive of her family or some other relationship a stalker (real or imagined) could destabilize, the effect would probably be more profound. At any rate, they could experience the satisfaction of exacting revenge in a somewhat clever way, increase the chances of modifying her behavior to such as they consider desirable, and even give her a fair warning about some of the very real threats (if not directly from them, then someone else) she invited with what she was doing. As far as I know (don't quote me) if they do so tactfully, nothing illegal will have actually taken place, which would likely minimize their overall level of risk and initial expense (or certainly result in a scenario with comparable risk and expense but greater effectiveness than your original scenario, if anything). This, of course, is all largely dependent on the type of person you end up running into (pun intended). If some part of what I described is illegal in any way, then of course I do not condone or recommend such actions. And how did I end up writing so much again? I blink, and there's a page. I don't know.
*ghost noises*
Hope you figure this out. Don't let the man keep you down!
