There was already a million vehicle recall for a vulnerability that allowed remote control of safety features (steering/breaking/acceleration control) that could be abused by anyone with a sprint mobile sim.
.... and the second US civil war starts up and one side has hacked into the automobile kill switches ...
"security" and "war" come in all sizes and shapes. Even inter-national warfare can be of the "cold" variety, in which nobody is nuking anybody else, but making automobiles randomly unreliable could be extremely effective (for a while, anyway).
I'd expect HN crowd to be smarter than nonsense security propaganda, yet it seems to work.