Being targeted for hacking only adds to the risk of being involved in a regular old accident, not replaces it; and no matter who you are, your odds of eventually being involved in a non-hacking related crash are pretty high. The difference in severity of injuries and risk of death in a car accident between a 2018 model and a 2003 model is considerable.

So unless you're Snowden and someone is actively trying to kill you, citing the risk of hacking as a rational safety-based reason to drive a 15 year-old car just doesn't hold water.

And if you are Snowden, physically tampering with a car or just forcing you off the road is so easy, hacking probably doesn't increase the risk profile much either. Granted, it's slightly more convenient for your would-be murderers.