That the government adds a "cause a car accident remotely" option to vehicles so that offending individuals traveling by car may die by the government remotely tweaking the car.
While it might be possible to remotely control a production car, cars now are safe enough that you'd need to have a lot of systems fail in order to ensure that an accident would be fatal. Things like, all the crumple zones not working as intended, airbags not going off, seat belts not locking properly, all at once. Or you could, I dunno, design the car so that the doors were only controlled electronically, and then ensure that if there was a fire or the car was submerged, the electronics failed (e.g., Teslas).
Yeah, guaranteeing a crash fatal is pretty hard. But doing anything weird to a car while it's traveling 70 on a highway with traffic has a pretty good chance of killing occupants. If you could make the brakes on just one wheel lock suddenly, you'd have quite a hairy situation.
I hit <<something>> on my motorcycle in a hard corner at 55+mph, maybe three years ago? Someone I was riding with said it might have been a turtle. :'(
Somehow I managed to not go down, and that should have been a perfect recipe for a slide into oncoming traffic.
I'm just saying that if you really want to kill someone, you'd want something a lot more certain than a remote-controlled accident.
This is definitely possible, since you can actually controll cars (at least some models) via a (non-public, but the capability is there) API. Two security researchers at defcon were able to find a way how to control a vehicle remotely, even including things like stopping or turning, and eventually made an exploit that could be used remotely to any car of the same model. So, if they wanted to, they were able to stop or turn the wheel of IIRC hundreds of thousands of cars around the world instantly, since the cars are connected to the network through GSM, so you don't even need to be anywhere near them.
It's been a few years since I saw the video, but IIRC the vehicle controls are on a separate board that should not be reachable from the other smart vehicle system. However, they were able to reverse engineer a way how to abuse framework update mechanism as a bridge, and use it to patch the framework to get it under their control. And then they discovered that they could actually trigger the update remotely.