Well, it is one thing to be nation-state R&D and another to be teenage-hacker accessible
DARPA CyberFastTrack 2013/2014 ... played a CD in the car, the audio triggered the brakes to lock up and the engine to shut off.
That was then, with no modifications to the computer hardware
The scale of the things that can go wrong on accident is worry enough
Basically today you have to assume that everything is compromised by the time it leaves the factory, either deliberately or by way of zero-day exploit bugs.
I do see it, but... I sometimes get paid to see such things
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