KRACK, ROCA, and device insecurity

I'm not sure seatbelts are the best analogy, though I certainly agree with the general sentiment. Certainly if devices must follow FCC guidelines not to cause harmful interference, it's reasonable that they should be hardened against recruitment into botnets used for DDoS attacks---surely a form of harmful interference.

Have security updates been demonstrated to save lives more or less directly like seatbelts have? In medical devices, I suppose?