Used to be people would break into other people's houses to steal stuff. Anonymous B&E was fairly common 30 or 40 years ago. Since then, B&E has dropped by 80% or more. That's because criminals figure that every house has two things they didn't have back then: a surveillance camera, and a gun. And even if there is no gun, they'd be made by the camera. So B&E doesn't pay anymore.
I think it would be the same if dashcams were standard equipment on new cars, which I can see them becoming in another decade, two tops. You wouldn't see this kind of nonsense, nor would you see people approaching cars to commit mayhem. They'd be made.