[quote=@DarkwolfX37]
<Snipped quote by Etcetera>

Foreign agents, mass shooters with coding knowledge, terrorists, assassins... So on and so forth.
[/quote]

Already expressed concern for this one.
They don't exist. And even if they did, it takes a world of extra knowledge to hack into them—coding is as far from hacking as boating is to swimming. And I already mentioned that rogue hackers would have a tough time with the systems if they even wanted to get in.
Terrorists are inbred inbeciles, so I think we're okay. Why hack a car when you can shoot a gun?
Assassins have other ways of killing people unless they work for a government entity, which was already mentioned. And it doesn't help that the govt. can already remotely shut down vehicles—I doubt that it'll be any more of an issue than it currently is, especially given how conspicuous it would be.