Without evidence of deliberate aggression the firearm is unnecessary (but comforting to know it's an option if you have it).

Don't forget that many LEOs have drawn pistols and killed people who were arguably driving toward them. They were vindicated as defending against assault with a deadly weapon. The car driven in their general direction was the deadly weapon.

I count myself lucky to have successfully visited, and driven, in Boston. Never again. I think they drive that way because of the belief that gun control will make them safe :-)