Made me think of Michael Hastings demise... https://youtu.be/7zakBULPETo
Any specific suspicious death may come and go, but the fact that something like this is believable with conventional networked cars is enough reason to be very skeptical of security and government access (and criminal access) claims of manufacturers, no matter how well-meaning.
Ultimately, I am alive because nobody cares enough to murder me.
I don't see what's wrong with having fewer things in your life which can silently kill you.
If you get in a new car, you are now completely at its mercy. There are few or no precautions you can take; you might as well lay on your back, and strap your arms down so your belly stays up.
What you're really doing is making it cheaper and easier to kill, misdirect, or trick you. This means that people who wanted to do these things before, but couldn't afford it, now can.