I don't think it's a good idea to post "what if's" on a public forum, it could come back to bite you in the ass.
I 100% agree about caution. I won't say what I would do in response to a threat, because there are far too many variables to be able to predict a threat and what the best response would be.
I will say that avoidance or escape is better than someone getting hurt. I can have a vehicle repaired or replaced, so I have to treat a car or truck as somewhat disposable. We've seen the videos of someone who gets out of the car after somebody hits it, and ends up in the fetal position being kicked and stomped.
Reginald Denny was never the same after he was attacked.
On the other hand, even if you're driving a Mercedes Geländewagen ("G-Wagen"), the cost of bail alone could exceed the price of replacing the vehicle, which last time I checked, started at $125,000, and generally went for more like $150,000 to $175,000. Bail and a good attorney could easily cost you more, even if all you did was punch someone in the nose when they tried to grab you through an open window. That doesn't include YOUR medical bills if things don't go according to your plan...
Not only could you face arrest, but lawsuits are likely to follow. Now you're past the cost of your vehicle and placing your house on the market or taking a second loan to cover legal fees. It isn't fair, but it can easily happen.
I'm more interested in talking about knowing alternate routes, sources of information for figuring out a safe route if I have to go downtown, what kind of medkit to keep handy, having a fire extinguisher in the car, etc.
I've changed the way I drive: I'm much more interested in what's happening a mile or more down the road. I have "won" more than one fight by seeing that it was about to happen and crossing the street, leaving the bar, etc. The best confrontations are the ones I'm not part of.
Respectfully,
Bob