If a screaming mob tried to block your car on the interstate at 1:45 AM, what would you do? I’d lay on the horn and bust through, too. Why sit there and wait for your car to be damaged, or worse, the mob pulls you out of your car?
The best thing to do is to have a firearm in your vehicle and be prepared to use it.
This is why I carry spare mags such that I’ve got around 60 rounds handy. I’m not going to be Reginald Denny. The extended Glock 18 mags are a good way to have a lot of spare ready ammo.
Really, the best thing to do is not stop. But if vehicles are blocking your way, you need to have a Plan B.