In all seriousness, ransomware that would kill someone won't be a remotely common thing - for one thing, it will be represented as "$COMPANY's lack of security

In all seriousness, ransomware that would kill someone won't be a remotely common thing - for one thing, it will be represented as "$COMPANY's lack of security KILLS PERSON X", and the bill for the ransom will need to be paid by them. And then the cops/secret-service would get involved. If there's a death involved (and reason to believe more will occur in the future, which would be necessary for ransom as a prolonged business model), then they will come down on any ransomware (and responsible negligent parties, such as auto companies with shitty security) like a TON OF BRICKS. Plus, there's still a lucrative malware model that goes like this: Infect the car, then quietly make it steal itself in the middle of the night (or at your moment of choice). Bam, you now have a stolen car that you can't be connected to, and nobody will notice for a while.